build for multiple platforms

Author: jrasko

.github/workflows/build.yml

@@ -66,6 +66,7 @@ jobs:
         uses: docker/build-push-action@v6
         with:
           push: true
+          platforms: linux/amd64,linux/arm64
           context: .
           cache-from: type=gha
           cache-to: type=gha,mode=max