Add CI with GitHub Actions to test and publish

.github/workflows/ci.yml

@@ -0,0 +1,21 @@
+name: CI/CD
+
+on:
+  push:
+  schedule:
+  - cron:  '1 0 * * *'
+
+jobs:
+  test:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@master
+    - name: Build Docker image
+      run: |
+        docker build . \
+          --file simple/Dockerfile \
+          --tag lukasheinrich/folding:$GITHUB_SHA \
+          --compress
+        docker images

.github/workflows/publish.yml

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+name: Publish Docker Images
+
+on:
+  push:
+    branches:
+    - master
+    tags:
+    - v*
+
+jobs:
+  build-and-publish:
+    name: Build and publish Docker images to Docker Hub
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@master
+    - name: Build and Publish to Registry
+      if: "! ${{ startsWith(github.ref, 'refs/tags/') }}"
+      uses: docker/build-push-action@v1
+      with:
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_PASSWORD }}
+        repository: lukasheinrich/folding
+        dockerfile: simple/Dockerfile
+        tags: latest,simple
+    - name: Build and Publish to Registry with Release Tag
+      if: ${{ startsWith(github.ref, 'refs/tags/') }}
+      uses: docker/build-push-action@v1
+      with:
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_PASSWORD }}
+        repository: lukasheinrich/folding
+        dockerfile: simple/Dockerfile
+        tags: latest,latest-stable,simple
+        tag_with_ref: true