Update Docker build workflow for improved steps

Author: shuesken

.github/workflows/docker-build.yml

@@ -5,28 +5,33 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    # Step 1: Checkout the repository code
-    - name: Checkout repository
-      uses: actions/checkout@v3
+      - name: Checkout repository
+        uses: actions/checkout@v2
 
-    # Step 2: Set up Docker Buildx (for multi-platform builds if needed)
-    - name: Set up Docker Buildx
-      uses: docker/setup-buildx-action@v2
+      # Login against a Docker registry except on PR
+      # https://github.com/docker/login-action
+      - name: Log into registry ${{ env.REGISTRY }}
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@28218f9b04b4f3f62068d7b6ce6ca5b26e35336c
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
 
-    # Step 3: Log in to GitHub Container Registry
-    - name: Log in to GHCR
-      uses: docker/login-action@v2
-      with:
-        registry: ghcr.io
-        username: ${{ github.actor }}
-        password: ${{ secrets.GITHUB_TOKEN }}
+      # Extract metadata (tags, labels) for Docker
+      # https://github.com/docker/metadata-action
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
 
-    # Step 4: Build the Docker image
-    - name: Build Docker image
-      run: |
-        docker build -t ghcr.io/${{ github.repository_owner }}/strfry:latest .
-
-    # Step 5: Push the Docker image to GHCR
-    - name: Push Docker image to GHCR
-      run: |
-        docker push ghcr.io/${{ github.repository_owner }}/strfry:latest
+      # Build and push Docker image with Buildx (don't push on PR)
+      # https://github.com/docker/build-push-action
+      - name: Build and push Docker image
+        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
+        with:
+          context: .
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}