move more fully to runtime config with release, improved docker build, updated phx liveview js

Dockerfile

@@ -1,31 +1,96 @@
-# ./Dockerfile
+# Find eligible builder and runner images on Docker Hub. We use Ubuntu/Debian instead of
+# Alpine to avoid DNS resolution issues in production.
+#
+# https://hub.docker.com/r/hexpm/elixir/tags?page=1&name=ubuntu
+# https://hub.docker.com/_/ubuntu?tab=tags
+#
+#
+# This file is based on these images:
+#
+#   - https://hub.docker.com/r/hexpm/elixir/tags - for the build image
+#   - https://hub.docker.com/_/debian?tab=tags&page=1&name=bullseye-20230109-slim - for the release image
+#   - https://pkgs.org/ - resource for finding needed packages
+#   - Ex: hexpm/elixir:1.14.3-erlang-25.2.1-debian-bullseye-20230109-slim
+#
+ARG ELIXIR_VERSION=1.14.3
+ARG OTP_VERSION=25.2.1
+ARG DEBIAN_VERSION=bullseye-20230109-slim
 
-# Extend from the official Elixir image
-FROM elixir:1.13.4-otp-25-alpine
+ARG BUILDER_IMAGE="hexpm/elixir:${ELIXIR_VERSION}-erlang-${OTP_VERSION}-debian-${DEBIAN_VERSION}"
+ARG RUNNER_IMAGE="debian:${DEBIAN_VERSION}"
 
-# # install the package postgresql-client to run pg_isready within entrypoint script
-# RUN apt-get update && \
-#   apt-get install -y postgresql-client
+FROM ${BUILDER_IMAGE} as builder
 
-# Create app directory and copy the Elixir project into it
-RUN mkdir /app
-COPY . /app
+# install build dependencies
+RUN apt-get update -y && apt-get install -y build-essential git curl && \
+    curl -fsSL https://deb.nodesource.com/setup_19.x | bash - && \
+    apt-get install -y nodejs && apt-get clean && \
+    rm -f /var/lib/apt/lists/*_* && npm i -g npm
+
+# prepare build dir
 WORKDIR /app
 
-# Install the build tools we'll need
-RUN apk update && \
-  apk upgrade --no-cache && \
-  apk add --no-cache \
-    build-base && \
-  mix local.rebar --force && \
-  mix local.hex --force
+# install hex + rebar
+RUN mix local.hex --force && \
+    mix local.rebar --force
 
+# set build ENV
+ENV MIX_ENV="prod"
 
-# The environment to build with
-ENV MIX_ENV=prod
+# install mix dependencies
+COPY mix.exs mix.lock ./
+RUN mix deps.get --only $MIX_ENV
+RUN mkdir config
 
-# Get deps and compile
-RUN mix do deps.get, deps.compile, compile
+# copy compile-time config files before we compile dependencies
+# to ensure any relevant config change will trigger the dependencies
+# to be re-compiled.
+COPY config/config.exs config/${MIX_ENV}.exs config/
+RUN mix deps.compile
 
-# Start command
-CMD = ["/app/entrypoint.sh"]
+COPY priv priv
+
+COPY lib lib
+
+COPY assets assets
+
+# install node modules
+RUN npm --prefix assets install
+# compile assets
+RUN mix assets.deploy
+
+# Compile the release
+RUN mix compile
+
+# Changes to config/runtime.exs don't require recompiling the code
+COPY config/runtime.exs config/
+
+COPY rel rel
+RUN mix release
+
+# start a new build stage so that the final image will only contain
+# the compiled release and other runtime necessities
+FROM ${RUNNER_IMAGE}
+
+RUN apt-get update -y && apt-get install -y libstdc++6 openssl libncurses5 locales \
+  && apt-get clean && rm -f /var/lib/apt/lists/*_*
+
+# Set the locale
+RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen && locale-gen
+
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+ENV LC_ALL en_US.UTF-8
+
+WORKDIR "/app"
+RUN chown nobody /app
+
+# set runner ENV
+ENV MIX_ENV="prod"
+
+# Only copy the final release from the build stage
+COPY --from=builder --chown=nobody:root /app/_build/${MIX_ENV}/rel/shift73k ./
+
+USER nobody
+
+CMD ["/app/bin/server"]