ci: build ARM64-compatible Docker images

Author: easybe

.github/workflows/main.yml

@@ -20,6 +20,9 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
       - name: Log in to Docker Hub
         uses: docker/login-action@v3
         with:
@@ -37,6 +40,7 @@ jobs:
         uses: docker/build-push-action@v6
         with:
           context: debian-arm
+          platforms: linux/amd64,linux/arm64
           push: true
           provenance: mode=max
           sbom: true