Dockerfiles from https://circleci.com/gh/circleci/circleci-images/11035

mongo/images/4.1.4-xenial/Dockerfile

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+###
+### DO NOT MODIFY THIS FILE.  THIS FILE HAS BEEN AUTOGENERATED
+###
+
+FROM mongo:4.1.4-xenial
+
+CMD ["mongod", "--nojournal", "--noprealloc", "--smallfiles"]

mongo/images/4.1.4-xenial/ram/Dockerfile

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+###
+### DO NOT MODIFY THIS FILE.  THIS FILE HAS BEEN AUTOGENERATED
+###
+
+FROM circleci/mongo:4.1.4-xenial
+
+# The ENTRYPOINT for mongo is at /usr/local/bin/docker-entrypoint.sh, but pre-3.6 images also
+# include a symlink from /entrypoint.sh to that script. So, it's only necessary to update the real
+# entrypoint file. This comment can be removed once all pre-3.6 mongo images are gone.
+RUN sed -i '/exec "$@"/i mkdir \/dev\/shm\/mongo' /usr/local/bin/docker-entrypoint.sh
+
+CMD ["mongod", "--nojournal", "--noprealloc", "--smallfiles", "--dbpath=/dev/shm/mongo"]

mongo/images/4.1.4/Dockerfile

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+###
+### DO NOT MODIFY THIS FILE.  THIS FILE HAS BEEN AUTOGENERATED
+###
+
+FROM mongo:4.1.4
+
+CMD ["mongod", "--nojournal", "--noprealloc", "--smallfiles"]

mongo/images/4.1.4/ram/Dockerfile

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+###
+### DO NOT MODIFY THIS FILE.  THIS FILE HAS BEEN AUTOGENERATED
+###
+
+FROM circleci/mongo:4.1.4
+
+# The ENTRYPOINT for mongo is at /usr/local/bin/docker-entrypoint.sh, but pre-3.6 images also
+# include a symlink from /entrypoint.sh to that script. So, it's only necessary to update the real
+# entrypoint file. This comment can be removed once all pre-3.6 mongo images are gone.
+RUN sed -i '/exec "$@"/i mkdir \/dev\/shm\/mongo' /usr/local/bin/docker-entrypoint.sh
+
+CMD ["mongod", "--nojournal", "--noprealloc", "--smallfiles", "--dbpath=/dev/shm/mongo"]

php/images/7.1.23-apache-jessie/Dockerfile

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+###
+### DO NOT MODIFY THIS FILE.  THIS FILE HAS BEEN AUTOGENERATED
+###
+
+FROM php:7.1.23-apache-jessie
+
+# make Apt non-interactive
+RUN echo 'APT::Get::Assume-Yes "true";' > /etc/apt/apt.conf.d/90circleci \
+  && echo 'DPkg::Options "--force-confnew";' >> /etc/apt/apt.conf.d/90circleci
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# man directory is missing in some base images
+# https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=863199
+RUN apt-get update \
+  && mkdir -p /usr/share/man/man1 \
+  && apt-get install -y \
+    git mercurial xvfb \
+    locales sudo openssh-client ca-certificates tar gzip parallel \
+    net-tools netcat unzip zip bzip2 gnupg curl wget
+
+
+# Set timezone to UTC by default
+RUN ln -sf /usr/share/zoneinfo/Etc/UTC /etc/localtime
+
+# Use unicode
+RUN locale-gen C.UTF-8 || true
+ENV LANG=C.UTF-8
+
+# install jq
+RUN JQ_URL="https://circle-downloads.s3.amazonaws.com/circleci-images/cache/linux-amd64/jq-latest" \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/bin/jq $JQ_URL \
+  && chmod +x /usr/bin/jq \
+  && jq --version
+
+# Install Docker
+
+# Docker.com returns the URL of the latest binary when you hit a directory listing
+# We curl this URL and `grep` the version out.
+# The output looks like this:
+
+#>    # To install, run the following commands as root:
+#>    curl -fsSLO https://download.docker.com/linux/static/stable/x86_64/docker-17.05.0-ce.tgz && tar --strip-components=1 -xvzf docker-17.05.0-ce.tgz -C /usr/local/bin
+#>
+#>    # Then start docker in daemon mode:
+#>    /usr/local/bin/dockerd
+
+RUN set -ex \
+  && export DOCKER_VERSION=$(curl --silent --fail --retry 3 https://download.docker.com/linux/static/stable/x86_64/ | grep -o -e 'docker-[.0-9]*-ce\.tgz' | sort -r | head -n 1) \
+  && DOCKER_URL="https://download.docker.com/linux/static/stable/x86_64/${DOCKER_VERSION}" \
+  && echo Docker URL: $DOCKER_URL \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/docker.tgz "${DOCKER_URL}" \
+  && ls -lha /tmp/docker.tgz \
+  && tar -xz -C /tmp -f /tmp/docker.tgz \
+  && mv /tmp/docker/* /usr/bin \
+  && rm -rf /tmp/docker /tmp/docker.tgz \
+  && which docker \
+  && (docker version || true)
+
+# docker compose
+RUN COMPOSE_URL="https://circle-downloads.s3.amazonaws.com/circleci-images/cache/linux-amd64/docker-compose-latest" \
+  && curl --silent --show-error --location --fail --retry 3 --output /usr/bin/docker-compose $COMPOSE_URL \
+  && chmod +x /usr/bin/docker-compose \
+  && docker-compose version
+
+# install dockerize
+RUN DOCKERIZE_URL="https://circle-downloads.s3.amazonaws.com/circleci-images/cache/linux-amd64/dockerize-latest.tar.gz" \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/dockerize-linux-amd64.tar.gz $DOCKERIZE_URL \
+  && tar -C /usr/local/bin -xzvf /tmp/dockerize-linux-amd64.tar.gz \
+  && rm -rf /tmp/dockerize-linux-amd64.tar.gz \
+  && dockerize --version
+
+RUN groupadd --gid 3434 circleci \
+  && useradd --uid 3434 --gid circleci --shell /bin/bash --create-home circleci \
+  && echo 'circleci ALL=NOPASSWD: ALL' >> /etc/sudoers.d/50-circleci \
+  && echo 'Defaults    env_keep += "DEBIAN_FRONTEND"' >> /etc/sudoers.d/env_keep
+
+# BEGIN IMAGE CUSTOMIZATIONS
+
+# Install composer
+RUN php -r "copy('https://raw.githubusercontent.com/composer/getcomposer.org/master/web/installer', 'composer-setup.php');" &&     php composer-setup.php &&     php -r "unlink('composer-setup.php');" &&     mv composer.phar /usr/local/bin/composer
+
+# Install XDebug
+RUN (pecl install xdebug || pecl install xdebug-2.5.5) && docker-php-ext-enable xdebug
+
+# Install common extensions
+RUN apt install -y libicu-dev zlib1g-dev
+RUN docker-php-ext-configure intl && docker-php-ext-install intl
+RUN docker-php-ext-install zip
+# END IMAGE CUSTOMIZATIONS
+
+USER circleci
+
+CMD ["/bin/sh"]

php/images/7.1.23-apache-jessie/browsers-legacy/Dockerfile

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+###
+### DO NOT MODIFY THIS FILE.  THIS FILE HAS BEEN AUTOGENERATED
+###
+
+FROM circleci/php:7.1.23-apache-jessie
+
+# install java 8
+#
+RUN if grep -q Debian /etc/os-release && grep -q jessie /etc/os-release; then \
+    echo "deb http://http.us.debian.org/debian/ jessie-backports main" | sudo tee -a /etc/apt/sources.list \
+    && echo "deb-src http://http.us.debian.org/debian/ jessie-backports main" | sudo tee -a /etc/apt/sources.list \
+    && sudo apt-get update; sudo apt-get install -y -t jessie-backports openjdk-8-jre openjdk-8-jre-headless openjdk-8-jdk openjdk-8-jdk-headless \
+  ; elif grep -q Ubuntu /etc/os-release && grep -q Trusty /etc/os-release; then \
+    echo "deb http://ppa.launchpad.net/openjdk-r/ppa/ubuntu trusty main" | sudo tee -a /etc/apt/sources.list \
+    && echo "deb-src http://ppa.launchpad.net/openjdk-r/ppa/ubuntu trusty main" | sudo tee -a /etc/apt/sources.list \
+    && sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-key DA1A4A13543B466853BAF164EB9B1D8886F44E2A \
+    && sudo apt-get update; sudo apt-get install -y openjdk-8-jre openjdk-8-jre-headless openjdk-8-jdk openjdk-8-jdk-headless \
+  ; else \
+    sudo apt-get update; sudo apt-get install -y openjdk-8-jre openjdk-8-jre-headless openjdk-8-jdk openjdk-8-jdk-headless \
+  ; fi
+
+ENV OPENSSL_CONF /
+
+## install phantomjs
+#
+RUN PHANTOMJS_URL="https://circle-downloads.s3.amazonaws.com/circleci-images/cache/linux-amd64/phantomjs-latest.tar.bz2" \
+  && sudo apt-get install libfontconfig \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/phantomjs.tar.bz2 ${PHANTOMJS_URL} \
+  && tar -x -C /tmp -f /tmp/phantomjs.tar.bz2 \
+  && sudo mv /tmp/phantomjs-*-linux-x86_64/bin/phantomjs /usr/local/bin \
+  && rm -rf /tmp/phantomjs.tar.bz2 /tmp/phantomjs-* \
+  && phantomjs --version
+
+# install firefox
+
+# If you are upgrading to any version newer than 47.0.1, you must check the compatibility with
+# selenium. See https://github.com/SeleniumHQ/selenium/issues/2559#issuecomment-237079591
+
+RUN FIREFOX_URL="https://s3.amazonaws.com/circle-downloads/firefox-mozilla-build_47.0.1-0ubuntu1_amd64.deb" \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/firefox.deb $FIREFOX_URL \
+  && echo 'ef016febe5ec4eaf7d455a34579834bcde7703cb0818c80044f4d148df8473bb  /tmp/firefox.deb' | sha256sum -c \
+  && sudo dpkg -i /tmp/firefox.deb || sudo apt-get -f install  \
+  && sudo apt-get install -y libgtk3.0-cil-dev libasound2 libasound2 libdbus-glib-1-2 libdbus-1-3 \
+  && rm -rf /tmp/firefox.deb \
+  && firefox --version
+
+# install geckodriver—disabling this temporarily, we will likely want this code in the future, but until we're ready to upgrade our version of firefox to 53+, geckodriver wont' be compatible...
+
+# RUN export GECKODRIVER_LATEST_RELEASE_URL=$(curl https://api.github.com/repos/mozilla/geckodriver/releases/latest | jq -r ".assets[] | select(.name | test(\"linux64\")) | .browser_download_url") \
+#      && curl --silent --show-error --location --fail --retry 3 --output /tmp/geckodriver_linux64.tar.gz "$GECKODRIVER_LATEST_RELEASE_URL" \
+#      && cd /tmp \
+#      && tar xf geckodriver_linux64.tar.gz \
+#      && rm -rf geckodriver_linux64.tar.gz \
+#      && sudo mv geckodriver /usr/local/bin/geckodriver \
+#      && sudo chmod +x /usr/local/bin/geckodriver \
+#      && geckodriver --version
+
+# install chrome
+
+RUN curl --silent --show-error --location --fail --retry 3 --output /tmp/google-chrome-stable_current_amd64.deb https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb \
+      && (sudo dpkg -i /tmp/google-chrome-stable_current_amd64.deb || sudo apt-get -fy install)  \
+      && rm -rf /tmp/google-chrome-stable_current_amd64.deb \
+      && sudo sed -i 's|HERE/chrome"|HERE/chrome" --disable-setuid-sandbox --no-sandbox|g' \
+           "/opt/google/chrome/google-chrome" \
+      && google-chrome --version
+
+RUN export CHROMEDRIVER_RELEASE=$(curl --location --fail --retry 3 http://chromedriver.storage.googleapis.com/LATEST_RELEASE) \
+      && curl --silent --show-error --location --fail --retry 3 --output /tmp/chromedriver_linux64.zip "http://chromedriver.storage.googleapis.com/$CHROMEDRIVER_RELEASE/chromedriver_linux64.zip" \
+      && cd /tmp \
+      && unzip chromedriver_linux64.zip \
+      && rm -rf chromedriver_linux64.zip \
+      && sudo mv chromedriver /usr/local/bin/chromedriver \
+      && sudo chmod +x /usr/local/bin/chromedriver \
+      && chromedriver --version
+
+# install libgconf-2-4 manually since chrome no longer pulls it in automatically
+RUN sudo apt-get install -y libgconf-2-4
+
+# start xvfb automatically to avoid needing to express in circle.yml
+ENV DISPLAY :99
+RUN printf '#!/bin/sh\nXvfb :99 -screen 0 1280x1024x24 &\nexec "$@"\n' > /tmp/entrypoint \
+  && chmod +x /tmp/entrypoint \
+        && sudo mv /tmp/entrypoint /docker-entrypoint.sh
+
+# ensure that the build agent doesn't override the entrypoint
+LABEL com.circleci.preserve-entrypoint=true
+
+ENTRYPOINT ["/docker-entrypoint.sh"]
+CMD ["/bin/sh"]

php/images/7.1.23-apache-jessie/browsers/Dockerfile

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+###
+### DO NOT MODIFY THIS FILE.  THIS FILE HAS BEEN AUTOGENERATED
+###
+
+FROM circleci/php:7.1.23-apache-jessie
+
+# install java 8
+#
+RUN if grep -q Debian /etc/os-release && grep -q jessie /etc/os-release; then \
+    echo "deb http://http.us.debian.org/debian/ jessie-backports main" | sudo tee -a /etc/apt/sources.list \
+    && echo "deb-src http://http.us.debian.org/debian/ jessie-backports main" | sudo tee -a /etc/apt/sources.list \
+    && sudo apt-get update; sudo apt-get install -y -t jessie-backports openjdk-8-jre openjdk-8-jre-headless openjdk-8-jdk openjdk-8-jdk-headless \
+  ; elif grep -q Ubuntu /etc/os-release && grep -q Trusty /etc/os-release; then \
+    echo "deb http://ppa.launchpad.net/openjdk-r/ppa/ubuntu trusty main" | sudo tee -a /etc/apt/sources.list \
+    && echo "deb-src http://ppa.launchpad.net/openjdk-r/ppa/ubuntu trusty main" | sudo tee -a /etc/apt/sources.list \
+    && sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-key DA1A4A13543B466853BAF164EB9B1D8886F44E2A \
+    && sudo apt-get update; sudo apt-get install -y openjdk-8-jre openjdk-8-jre-headless openjdk-8-jdk openjdk-8-jdk-headless \
+  ; else \
+    sudo apt-get update; sudo apt-get install -y openjdk-8-jre openjdk-8-jre-headless openjdk-8-jdk openjdk-8-jdk-headless \
+  ; fi \
+  && sudo apt-get install -y bzip2 libgconf-2-4 # for extracting firefox and running chrome, respectively
+
+# install firefox
+#
+RUN FIREFOX_URL="https://download.mozilla.org/?product=firefox-latest-ssl&os=linux64&lang=en-US" \
+  && ACTUAL_URL=$(curl -Ls -o /dev/null -w %{url_effective} $FIREFOX_URL) \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/firefox.tar.bz2 $ACTUAL_URL \
+  && sudo tar -xvjf /tmp/firefox.tar.bz2 -C /opt \
+  && sudo ln -s /opt/firefox/firefox /usr/local/bin/firefox \
+  && sudo apt-get install -y libgtk3.0-cil-dev libasound2 libasound2 libdbus-glib-1-2 libdbus-1-3 \
+  && rm -rf /tmp/firefox.* \
+  && firefox --version
+
+# install geckodriver
+
+RUN export GECKODRIVER_LATEST_RELEASE_URL=$(curl https://api.github.com/repos/mozilla/geckodriver/releases/latest | jq -r ".assets[] | select(.name | test(\"linux64\")) | .browser_download_url") \
+     && curl --silent --show-error --location --fail --retry 3 --output /tmp/geckodriver_linux64.tar.gz "$GECKODRIVER_LATEST_RELEASE_URL" \
+     && cd /tmp \
+     && tar xf geckodriver_linux64.tar.gz \
+     && rm -rf geckodriver_linux64.tar.gz \
+     && sudo mv geckodriver /usr/local/bin/geckodriver \
+     && sudo chmod +x /usr/local/bin/geckodriver \
+     && geckodriver --version
+
+# install chrome
+
+RUN curl --silent --show-error --location --fail --retry 3 --output /tmp/google-chrome-stable_current_amd64.deb https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb \
+      && (sudo dpkg -i /tmp/google-chrome-stable_current_amd64.deb || sudo apt-get -fy install)  \
+      && rm -rf /tmp/google-chrome-stable_current_amd64.deb \
+      && sudo sed -i 's|HERE/chrome"|HERE/chrome" --disable-setuid-sandbox --no-sandbox|g' \
+           "/opt/google/chrome/google-chrome" \
+      && google-chrome --version
+
+RUN export CHROMEDRIVER_RELEASE=$(curl --location --fail --retry 3 http://chromedriver.storage.googleapis.com/LATEST_RELEASE) \
+      && curl --silent --show-error --location --fail --retry 3 --output /tmp/chromedriver_linux64.zip "http://chromedriver.storage.googleapis.com/$CHROMEDRIVER_RELEASE/chromedriver_linux64.zip" \
+      && cd /tmp \
+      && unzip chromedriver_linux64.zip \
+      && rm -rf chromedriver_linux64.zip \
+      && sudo mv chromedriver /usr/local/bin/chromedriver \
+      && sudo chmod +x /usr/local/bin/chromedriver \
+      && chromedriver --version
+
+# start xvfb automatically to avoid needing to express in circle.yml
+ENV DISPLAY :99
+RUN printf '#!/bin/sh\nXvfb :99 -screen 0 1280x1024x24 &\nexec "$@"\n' > /tmp/entrypoint \
+  && chmod +x /tmp/entrypoint \
+        && sudo mv /tmp/entrypoint /docker-entrypoint.sh
+
+# ensure that the build agent doesn't override the entrypoint
+LABEL com.circleci.preserve-entrypoint=true
+
+ENTRYPOINT ["/docker-entrypoint.sh"]
+CMD ["/bin/sh"]

php/images/7.1.23-apache-jessie/node-browsers-legacy/Dockerfile

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+###
+### DO NOT MODIFY THIS FILE.  THIS FILE HAS BEEN AUTOGENERATED
+###
+
+#
+# DO NOT MODIFY THIS FILE.  THIS FILE HAS BEEN AUTOGENERATED
+#
+FROM circleci/php:7.1.23-apache-jessie-node
+
+# install java 8
+#
+RUN if grep -q Debian /etc/os-release && grep -q jessie /etc/os-release; then \
+    echo "deb http://http.us.debian.org/debian/ jessie-backports main" | sudo tee -a /etc/apt/sources.list \
+    && echo "deb-src http://http.us.debian.org/debian/ jessie-backports main" | sudo tee -a /etc/apt/sources.list \
+    && sudo apt-get update; sudo apt-get install -y -t jessie-backports openjdk-8-jre openjdk-8-jre-headless openjdk-8-jdk openjdk-8-jdk-headless \
+  ; elif grep -q Ubuntu /etc/os-release && grep -q Trusty /etc/os-release; then \
+    echo "deb http://ppa.launchpad.net/openjdk-r/ppa/ubuntu trusty main" | sudo tee -a /etc/apt/sources.list \
+    && echo "deb-src http://ppa.launchpad.net/openjdk-r/ppa/ubuntu trusty main" | sudo tee -a /etc/apt/sources.list \
+    && sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-key DA1A4A13543B466853BAF164EB9B1D8886F44E2A \
+    && sudo apt-get update; sudo apt-get install -y openjdk-8-jre openjdk-8-jre-headless openjdk-8-jdk openjdk-8-jdk-headless \
+  ; else \
+    sudo apt-get update; sudo apt-get install -y openjdk-8-jre openjdk-8-jre-headless openjdk-8-jdk openjdk-8-jdk-headless \
+  ; fi
+
+ENV OPENSSL_CONF /
+
+## install phantomjs
+#
+RUN PHANTOMJS_URL="https://circle-downloads.s3.amazonaws.com/circleci-images/cache/linux-amd64/phantomjs-latest.tar.bz2" \
+  && sudo apt-get install libfontconfig \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/phantomjs.tar.bz2 ${PHANTOMJS_URL} \
+  && tar -x -C /tmp -f /tmp/phantomjs.tar.bz2 \
+  && sudo mv /tmp/phantomjs-*-linux-x86_64/bin/phantomjs /usr/local/bin \
+  && rm -rf /tmp/phantomjs.tar.bz2 /tmp/phantomjs-* \
+  && phantomjs --version
+
+# install firefox
+
+# If you are upgrading to any version newer than 47.0.1, you must check the compatibility with
+# selenium. See https://github.com/SeleniumHQ/selenium/issues/2559#issuecomment-237079591
+
+RUN FIREFOX_URL="https://s3.amazonaws.com/circle-downloads/firefox-mozilla-build_47.0.1-0ubuntu1_amd64.deb" \
+  && curl --silent --show-error --location --fail --retry 3 --output /tmp/firefox.deb $FIREFOX_URL \
+  && echo 'ef016febe5ec4eaf7d455a34579834bcde7703cb0818c80044f4d148df8473bb  /tmp/firefox.deb' | sha256sum -c \
+  && sudo dpkg -i /tmp/firefox.deb || sudo apt-get -f install  \
+  && sudo apt-get install -y libgtk3.0-cil-dev libasound2 libasound2 libdbus-glib-1-2 libdbus-1-3 \
+  && rm -rf /tmp/firefox.deb \
+  && firefox --version
+
+# install geckodriver—disabling this temporarily, we will likely want this code in the future, but until we're ready to upgrade our version of firefox to 53+, geckodriver wont' be compatible...
+
+# RUN export GECKODRIVER_LATEST_RELEASE_URL=$(curl https://api.github.com/repos/mozilla/geckodriver/releases/latest | jq -r ".assets[] | select(.name | test(\"linux64\")) | .browser_download_url") \
+#      && curl --silent --show-error --location --fail --retry 3 --output /tmp/geckodriver_linux64.tar.gz "$GECKODRIVER_LATEST_RELEASE_URL" \
+#      && cd /tmp \
+#      && tar xf geckodriver_linux64.tar.gz \
+#      && rm -rf geckodriver_linux64.tar.gz \
+#      && sudo mv geckodriver /usr/local/bin/geckodriver \
+#      && sudo chmod +x /usr/local/bin/geckodriver \
+#      && geckodriver --version
+
+# install chrome
+
+RUN curl --silent --show-error --location --fail --retry 3 --output /tmp/google-chrome-stable_current_amd64.deb https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb \
+      && (sudo dpkg -i /tmp/google-chrome-stable_current_amd64.deb || sudo apt-get -fy install)  \
+      && rm -rf /tmp/google-chrome-stable_current_amd64.deb \
+      && sudo sed -i 's|HERE/chrome"|HERE/chrome" --disable-setuid-sandbox --no-sandbox|g' \
+           "/opt/google/chrome/google-chrome" \
+      && google-chrome --version
+
+RUN export CHROMEDRIVER_RELEASE=$(curl --location --fail --retry 3 http://chromedriver.storage.googleapis.com/LATEST_RELEASE) \
+      && curl --silent --show-error --location --fail --retry 3 --output /tmp/chromedriver_linux64.zip "http://chromedriver.storage.googleapis.com/$CHROMEDRIVER_RELEASE/chromedriver_linux64.zip" \
+      && cd /tmp \
+      && unzip chromedriver_linux64.zip \
+      && rm -rf chromedriver_linux64.zip \
+      && sudo mv chromedriver /usr/local/bin/chromedriver \
+      && sudo chmod +x /usr/local/bin/chromedriver \
+      && chromedriver --version
+
+# install libgconf-2-4 manually since chrome no longer pulls it in automatically
+RUN sudo apt-get install -y libgconf-2-4
+
+# start xvfb automatically to avoid needing to express in circle.yml
+ENV DISPLAY :99
+RUN printf '#!/bin/sh\nXvfb :99 -screen 0 1280x1024x24 &\nexec "$@"\n' > /tmp/entrypoint \
+  && chmod +x /tmp/entrypoint \
+        && sudo mv /tmp/entrypoint /docker-entrypoint.sh
+
+# ensure that the build agent doesn't override the entrypoint
+LABEL com.circleci.preserve-entrypoint=true
+
+ENTRYPOINT ["/docker-entrypoint.sh"]
+CMD ["/bin/sh"]