Rework GitHub Actions / release only on merges

With this PR we rework our GitHub actions and split them into two. One
is triggered for pull requests and executes our tests. The second one
runs for merges onto master. It executes the test as well but also
builds the docker image and pushes it to DockerHub.

.github/workflows/ruby.yml → .github/workflows/test-build-release.yml

@@ -5,13 +5,13 @@
 # This workflow will download a prebuilt Ruby version, install dependencies and run tests with Rake
 # For more information see: https://github.com/marketplace/actions/setup-ruby-jruby-and-truffleruby
 
-name: Ruby
+name: test-build-release
 
 on:
   push:
-    branches: [ master ]
+    branches: master
   pull_request:
-    branches: [ master ]
+    branches: master
 
 jobs:
   test:
@@ -41,22 +41,23 @@ jobs:
         bundle install
     - name: Run tests
       run: bundle exec rake rubocop
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v1
+    - name: Login to DockerHub
+      uses: docker/login-action@v1
+      with:
+        username: ${{ secrets.DOCKERHUB_USERNAME }}
+        password: ${{ secrets.DOCKERHUB_TOKEN }}
     - name: Build and push Docker images
       uses: docker/build-push-action@v2
       with:
-        username: ${{ secrets.DOCKER_USERNAME }}
-        password: ${{ secrets.DOCKER_PASSWORD }}
-        repository: voxpupuli/vox-pupuli-tasks
         add_git_labels: true
         tags: latest
         tag_with_ref: true
         tag_with_sha: true
     - name: Build and push Docker images
       uses: docker/build-push-action@v2
       with:
-        username: ${{ secrets.DOCKER_USERNAME }}
-        password: ${{ secrets.DOCKER_PASSWORD }}
-        repository: voxpupuli/vox-pupuli-tasks
         add_git_labels: true
         tag_with_ref: true
         push: ${{ startsWith(github.ref, 'refs/tags/') }}

.github/workflows/test-build.yml

@@ -0,0 +1,41 @@
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+# This workflow will download a prebuilt Ruby version, install dependencies and run tests with Rake
+# For more information see: https://github.com/marketplace/actions/setup-ruby-jruby-and-truffleruby
+
+name: test-build
+
+on:
+  pull_request:
+    branches: master
+
+jobs:
+  test:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Ruby
+    # To automatically get bug fixes and new Ruby versions for ruby/setup-ruby,
+    # change this to (see https://github.com/ruby/setup-ruby#versioning):
+    # uses: ruby/setup-ruby@v1
+      uses: ruby/setup-ruby@ec106b438a1ff6ff109590de34ddc62c540232e0
+      with:
+        ruby-version: 2.7
+    - uses: actions/cache@v2
+      with:
+        path: vendor/bundle
+        key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-gems-
+    - name: Install dependencies
+      run: |
+        bundle config set path vendor/bundle
+        bundle config set jobs $(nproc)
+        bundle config set without development
+        bundle install
+    - name: Run tests
+      run: bundle exec rake rubocop