added docker file location to build & push

.github/workflows/publish-netclient-docker.yml

@@ -77,6 +77,7 @@ jobs:
         with:
           context: .
           platforms: linux/amd64, linux/arm64
+          file: ./docker/Dockerfile-netclient-multiarch
           push: true
           tags: gravitl/netclient:${{ env.TAG }}
           build-args: version=${{ env.TAG }}