improve dev setup

* add doker build action
* add test worklflow running in docker buildx
* use multistage build

.github/workflows/docker.yml

@@ -0,0 +1,39 @@
+name: Docker
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Docker meta
+        uses: docker/metadata-action@v5
+        id: meta
+        with:
+          images: foodcoops/foodsoft
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          push: ${{ !github.event_name != 'pull_request' }}
+          tags: ghcr.io/${{ github.repository }}:latest
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          build-args: |
+              BUILDTIME=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.created'] }}
+              REVISION=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.revision'] }}

.github/workflows/test.yml

@@ -0,0 +1,17 @@
+name: Tests
+
+on: [push, pull_request]
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Run Tests
+        run: |
+          docker build \
+            --target test \
+            .

Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.7.8
+FROM ruby:2.7.8 AS base
 
 RUN supercronicUrl=https://github.com/aptible/supercronic/releases/download/v0.1.3/supercronic-linux-amd64 && \
     supercronicBin=/usr/local/bin/supercronic && \
@@ -7,29 +7,48 @@ RUN supercronicUrl=https://github.com/aptible/supercronic/releases/download/v0.1
     echo "$supercronicSha1sum  $supercronicBin" | sha1sum -c - && \
     chmod +x "$supercronicBin"
 
+ARG RAILS_ENV=production
+
 ENV PORT=3000 \
     SMTP_SERVER_PORT=2525 \
-    RAILS_ENV=production \
+    RAILS_ENV=${RAILS_ENV} \
     RAILS_LOG_TO_STDOUT=true \
     RAILS_SERVE_STATIC_FILES=true
 
 WORKDIR /usr/src/app
 
-COPY . ./
+RUN --mount=type=cache,target=/var/cache/apt/ \
+    buildDeps='libmagic-dev mariadb-server nodejs' && \
+    apt-get update && \
+    apt-get install --no-install-recommends -y $buildDeps
+
+COPY plugins plugins
+COPY config config
+COPY config.ru Gemfile Gemfile.lock proc-start Procfile Rakefile VERSION ./
+COPY app app
+COPY bin bin
+COPY db db
+COPY lib lib
+COPY script script
+COPY spec spec
+COPY vendor vendor
 
 # install dependencies and generate crontab
-RUN buildDeps='libmagic-dev' && \
-    apt-get update && \
-    apt-get install --no-install-recommends -y $buildDeps && \
-    echo 'gem: --no-document' >> ~/.gemrc && \
+RUN echo 'gem: --no-document' >> ~/.gemrc && \
     gem install bundler -v 2.4.22 && \
     bundle config build.nokogiri "--use-system-libraries" && \
     bundle install --deployment --without development test -j 4 && \
-    apt-get purge -y --auto-remove $buildDeps && \
-    rm -Rf /var/lib/apt/lists/* /var/cache/apt/* ~/.gemrc ~/.bundle && \
-    \
     bundle exec whenever >crontab
 
+FROM base AS test
+
+WORKDIR /usr/src/app
+RUN bundle install --deployment --with development --with test -j 4
+COPY .rubocop.yml .rubocop_todo.yml ./
+RUN bundle exec rubocop --format github --parallel
+
+FROM base AS dist
+
 # compile assets with temporary mysql server
 RUN export DATABASE_URL=mysql2://localhost/temp?encoding=utf8 && \
     export SECRET_KEY_BASE=thisisnotimportantnow && \
@@ -46,7 +65,8 @@ RUN export DATABASE_URL=mysql2://localhost/temp?encoding=utf8 && \
     /etc/init.d/mariadb stop && \
     rm -Rf /run/mysqld /tmp/* /var/tmp/* /var/lib/mysql /var/log/mysql* && \
     apt-get purge -y --auto-remove mariadb-server && \
-    rm -Rf /var/lib/apt/lists/* /var/cache/apt/*
+    apt-get purge -y --auto-remove $buildDeps && \
+    rm -Rf /var/lib/apt/lists/* /var/cache/apt/* ~/.gemrc ~/.bundle
 
 # Make relevant dirs and files writable for app user
 RUN mkdir -p tmp storage && \