Migrate the Docker build process to GitHub Actions

.github/workflows/deploy.yaml

@@ -0,0 +1,57 @@
+name: Test & build Docker image
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+
+env:
+  IMAGE_NAME: trafex/wordpress
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Build image
+        run: |-
+          docker build -t $IMAGE_NAME .
+          docker tag $IMAGE_NAME:latest $IMAGE_NAME:${{ github.sha }}
+
+      - name: Smoke test image
+        run: |-
+          docker-compose -f docker-compose.test.yml up -d wordpress
+          docker-compose -f docker-compose.test.yml run sut
+
+      - name: Run Trivy vulnerability scanner
+        uses: aquasecurity/trivy-action@master
+        with:
+          image-ref: '${{ env.IMAGE_NAME }}:${{ github.sha }}'
+          format: 'template'
+          template: '@/contrib/sarif.tpl'
+          output: 'trivy-results.sarif'
+
+      - name: Upload Trivy scan results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@v1
+        with:
+          sarif_file: 'trivy-results.sarif'
+
+      - name: Login to Docker Hub
+        if: github.ref == 'refs/heads/master' && github.event_name == 'push'
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Push latest image
+        if: github.ref == 'refs/heads/master' && github.event_name == 'push'
+        run: |-
+          docker push $IMAGE_NAME:latest
+
+      - name: Push tagged image
+        if: contains(github.ref, 'refs/tags/v')
+        run: |-
+          docker push $IMAGE_NAME:$GITHUB_TAG

docker-compose.test.yml

@@ -22,7 +22,7 @@ services:
       FS_METHOD: direct
 
   sut:
-    image: alpine:3.10
+    image: alpine:3.13
     depends_on:
       - wordpress
     command: /tmp/run_tests.sh