Add basic docker container image build support

docker/Dockerfile

@@ -0,0 +1,46 @@
+# vim: set et ts=4 sw=4 ft=dockerfile:
+
+# A basic Dockerfile for packaging up mssql-cli as a better alternative to sqlcmd.
+
+FROM ubuntu:20.04
+
+ARG DEBIAN_FRONTEND=noninteractive
+ARG TZ=UTC
+ARG LANG=en_US.UTF-8
+
+# Make apt quiet.
+RUN apt-get update && \
+    LANG=C apt-get --no-install-recommends -y install locales && \
+        locale-gen ${LANG} && update-locale LANG=${LANG} && \
+    DEBIAN_FRONTEND=${DEBIAN_FRONTEND} TZ=${TZ} \
+        apt-get --no-install-recommends -y install tzdata && \
+    DEBIAN_FRONTEND=${DEBIAN_FRONTEND} TZ=${TZ} \
+        dpkg-reconfigure tzdata && \
+    apt-get -y clean && rm -rf /var/lib/apt/lists/*
+
+# Install the dependent packages we need.
+RUN apt-get update && \
+    apt-get --no-install-recommends -y install \
+        less python3 python3-pip libicu-dev && \
+    update-alternatives --install /usr/bin/python python /usr/bin/python3 1000 && \
+    python3 -m pip install --no-cache-dir -U pip && \
+    apt-get -y clean && rm -rf /var/lib/apt/lists/* && \
+    mkdir -p /src/mssql-cli/
+
+# Copy and install the python module for mssql-cli.
+WORKDIR /src/mssql-cli/
+COPY . /src/mssql-cli/
+RUN python3 -m pip install --no-cache-dir -U -e /src/mssql-cli/
+
+# Verify that the command runs.
+RUN mssql-cli --help
+
+# A few quality of life improvements:
+# - Don't beep/bell on tab completion failure.
+RUN echo 'set bell-style none' >> /etc/inputrc
+
+ENV PAGER=less
+ENV LESS=-iRQX
+
+ENTRYPOINT ["/usr/local/bin/mssql-cli"]
+CMD ["/usr/local/bin/mssql-cli", "--help"]

docker/Makefile

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+IMAGE_TAG := mssql-cli:latest
+
+#DOCKER_BUILDKIT := 1
+#export DOCKER_BUILDKIT
+
+.PHONY: all
+all: publish
+
+.PHONY: image
+image:
+	docker build --build-arg=http_proxy=${http_proxy} --build-arg=https_proxy=${https_proxy} -t ${IMAGE_TAG} -f ./Dockerfile ..
+
+.PHONY: publish
+publish: image
+	@echo "TODO: Publish is not yet implemented."