Push chart to subproject directory in staging repo

Author: nojnhuh

cloudbuild.yaml

@@ -7,6 +7,6 @@ steps:
   entrypoint: make
   env:
   - DRIVER_IMAGE_REGISTRY=us-central1-docker.pkg.dev/k8s-staging-images/dra-example-driver
-  - DRIVER_CHART_REGISTRY=us-central1-docker.pkg.dev/k8s-staging-images/charts
+  - DRIVER_CHART_REGISTRY=us-central1-docker.pkg.dev/k8s-staging-images/dra-example-driver/charts
   args:
     - push-release-artifacts