Create multi-platform images

Author: jnonino

.github/workflows/publish.yml

@@ -20,21 +20,31 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v5
-      - name: Log in to the Container registry
+
+      - name: Login to the container registry
         uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Process metadata (tags, labels)
         id: meta
         uses: docker/metadata-action@v5
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
       - name: Build and push Docker image
         uses: docker/build-push-action@v6
         with:
           context: .
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64, linux/arm64