feat: use release to deploy application

Adjust `Dockerfile` and `docker-compose` to use the `release` structure.

Dockerfile

@@ -1,10 +1,70 @@
-FROM hexpm/elixir:1.17.2-erlang-27.0.1-debian-bookworm-20240701-slim AS builder
+ARG ELIXIR_VERSION=1.17.2
+ARG OTP_VERSION=27.0.1
+ARG DEBIAN_VERSION=bookworm-20240701-slim
+ARG BUILDER_IMAGE="hexpm/elixir:${ELIXIR_VERSION}-erlang-${OTP_VERSION}-debian-${DEBIAN_VERSION}"
+ARG RUNNER_IMAGE="debian:${DEBIAN_VERSION}"
 
+FROM ${BUILDER_IMAGE} AS builder
 RUN apt-get update \
-  && apt-get -y install git make
-
+  && apt-get -y install \
+    build-essential \
+    git \
+    make \
+  && apt-get clean \
+  && rm -rf /var/lib/ap/lists/*_*
 WORKDIR /opt/app
+# install hex + rebar
+RUN mix do local.hex --force, local.rebar --force
+# set build ENV
+ARG BUILD_MIX_ENV=prod
+ENV MIX_ENV=${BUILD_MIX_ENV}
+# install mix dependencies
+COPY mix.exs mix.lock ./
+RUN mix deps.get --only ${MIX_ENV}
+RUN mkdir config
+# copy compile-time config files before we compile dependencies
+# to ensure any relevant config change will trigger the dependencies
+# to be re-compiled.
+COPY config/config.exs config/${BUILD_MIX_ENV}.exs config/
+RUN mix deps.compile
+COPY priv priv
+COPY lib lib
+# 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
 COPY ./mix.exs ./
-COPY ./mix.lock ./
-RUN mix do local.hex --force, local.rebar --force \
-  && mix do deps.get, deps.compile
+EXPOSE 4000
+ENTRYPOINT ["./priv/docker/service/docker-entrypoint.sh"]
+CMD ["sample-cookie"]
+
+# start a new build stage so that the final image will only contain
+# the compiled release and other runtime necessities
+FROM ${RUNNER_IMAGE}
+RUN apt-get update -y \
+  && apt-get install -y \
+    ca-certificates \
+    libncurses5 \
+    libstdc++6 \
+    locales \
+    openssl \
+    tini \
+  && apt-get clean && rm -f /var/lib/apt/lists/*_*
+# Set the locale
+RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen && locale-gen
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+ENV LC_ALL en_US.UTF-8
+WORKDIR /opt/app
+RUN chown nobody /opt/app
+# set runner ENV
+ARG BUILD_MIX_ENV=prod
+ENV MIX_ENV=${BUILD_MIX_ENV}
+# Only copy the final release from the build stage
+COPY --from=builder --chown=nobody:root /app/_build/${BUILD_MIX_ENV}/rel/wabanex ./
+USER nobody
+EXPOSE 4000
+ENTRYPOINT ["tini", "--"]
+CMD ["/app/bin/server"]

docker-compose.yml

@@ -17,6 +17,8 @@ services:
     build:
       target: builder
       context: .
+      args:
+        BUILD_MIX_ENV: dev
     hostname: app
     depends_on:
       - db

lib/wabanex/release.ex

@@ -0,0 +1,28 @@
+defmodule Wabanex.Release do
+  @moduledoc """
+  Used for executing DB release tasks when run in production without Mix
+  installed.
+  """
+  @app :wabanex
+
+  def migrate do
+    load_app()
+
+    for repo <- repos() do
+      {:ok, _, _} = Ecto.Migrator.with_repo(repo, &Ecto.Migrator.run(&1, :up, all: true))
+    end
+  end
+
+  def rollback(repo, version) do
+    load_app()
+    {:ok, _, _} = Ecto.Migrator.with_repo(repo, &Ecto.Migrator.run(&1, :down, to: version))
+  end
+
+  defp repos do
+    Application.fetch_env!(@app, :ecto_repos)
+  end
+
+  defp load_app do
+    Application.load(@app)
+  end
+end

rel/overlays/bin/migrate

@@ -0,0 +1,5 @@
+#!/bin/sh
+set -eu
+
+cd -P -- "$(dirname -- "$0")"
+exec ./wabanex eval Wabanex.Release.migrate

rel/overlays/bin/migrate.bat

@@ -0,0 +1 @@
+call "%~dp0\wabanex" eval Wabanex.Release.migrate

rel/overlays/bin/server

@@ -0,0 +1,5 @@
+#!/bin/sh
+set -eu
+
+cd -P -- "$(dirname -- "$0")"
+PHX_SERVER=true exec ./wabanex start

rel/overlays/bin/server.bat

@@ -0,0 +1,2 @@
+set PHX_SERVER=true
+call "%~dp0\wabanex" start