enable arm build (#243)

Author: kvaps

.github/workflows/docker-publish.yaml

@@ -71,6 +71,7 @@ jobs:
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64, linux/arm64
           cache-from: type=gha
           cache-to: type=gha,mode=max