Switch to Dockerfile from hexdocs.pm

Author: mitchsayre

Dockerfile

@@ -10,10 +10,14 @@
 #   - https://hub.docker.com/r/hexpm/elixir/tags - for the build image
 #   - https://hub.docker.com/_/debian?tab=tags&page=1&name=bullseye-20210902-slim - for the release image
 #   - https://pkgs.org/ - resource for finding needed packages
-#   - Ex: hexpm/elixir:1.12.0-erlang-24.0.1-debian-bullseye-20210902-slim
+#   - Ex: hexpm/elixir:1.14.0-erlang-24.3.4-debian-bullseye-20210902-slim
 #
-ARG BUILDER_IMAGE="hexpm/elixir:1.12.0-erlang-24.0.1-debian-bullseye-20210902-slim"
-ARG RUNNER_IMAGE="debian:bullseye-20210902-slim"
+ARG ELIXIR_VERSION=1.14.0
+ARG OTP_VERSION=24.3.4
+ARG DEBIAN_VERSION=bullseye-20210902-slim
+
+ARG BUILDER_IMAGE="hexpm/elixir:${ELIXIR_VERSION}-erlang-${OTP_VERSION}-debian-${DEBIAN_VERSION}"
+ARG RUNNER_IMAGE="debian:${DEBIAN_VERSION}"
 
 FROM ${BUILDER_IMAGE} as builder
 
@@ -22,16 +26,14 @@ RUN apt-get update -y && apt-get install -y build-essential git \
     && apt-get clean && rm -f /var/lib/apt/lists/*_*
 
 # prepare build dir
-# WORKDIR /app
-ENV MIX_ENV="dev"
+WORKDIR /app
 
 # install hex + rebar
 RUN mix local.hex --force && \
     mix local.rebar --force
 
 # set build ENV
-# ENV MIX_ENV="prod"
-ENV MIX_ENV="dev"
+ENV MIX_ENV="prod"
 
 # install mix dependencies
 COPY mix.exs mix.lock ./
@@ -46,9 +48,6 @@ RUN mix deps.compile
 
 COPY priv priv
 
-# Compile the release
-COPY lib lib
-
 # note: if your project uses a tool like https://purgecss.com/,
 # which customizes asset compilation based on what it finds in
 # your Elixir templates, you will need to move the asset compilation
@@ -58,6 +57,9 @@ COPY assets assets
 # compile assets
 RUN mix assets.deploy
 
+# Compile the release
+COPY lib lib
+
 RUN mix compile
 
 # Changes to config/runtime.exs don't require recompiling the code
@@ -83,13 +85,17 @@ ENV LC_ALL en_US.UTF-8
 WORKDIR "/app"
 RUN chown nobody /app
 
+# set runner ENV
+ENV MIX_ENV="prod"
+
 # Only copy the final release from the build stage
-COPY --from=builder --chown=nobody:root /app/_build/prod/rel/live_beats ./
+COPY --from=builder --chown=nobody:root /app/_build/${MIX_ENV}/rel/my_app ./
 
 USER nobody
 
-# Set the runtime ENV
-ENV ECTO_IPV6="true"
-ENV ERL_AFLAGS="-proto_dist inet6_tcp"
+# If using an environment that doesn't automatically reap zombie processes, it is
+# advised to add an init process such as tini via `apt-get install`
+# above and adding an entrypoint. See https://github.com/krallin/tini for details
+# ENTRYPOINT ["/tini", "--"]
 
 CMD /app/bin/server