Configure multi-platform docker builds

.github/workflows/docker-publish.yaml

@@ -26,6 +26,14 @@ jobs:
     steps:
       - name: Check out the repo
         uses: actions/checkout@v3
+        
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      # https://github.com/docker/setup-buildx-action
+      
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
       
       - name: Log in to Docker Hub
         uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
@@ -40,9 +48,10 @@ jobs:
           images: bellingcat/auto-archiver
       
       - name: Build and push Docker image
-        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
+        uses: docker/build-push-action@v2
         with:
           context: .
-          push: true
+          platforms: linux/amd64,linux/arm/v7,linux/arm64,linux/arm64/v8
+          push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
+          labels: ${{ steps.meta.outputs.labels }}