Thank you for sharing the article.

**update: `gcloud docker` will not be supported for Docker client versions above 18.03.

As an alternative, use `gcloud auth configure-docker` to configure `docker` to use `gcloud` as a credential helper, then use `docker` as you would for non-GCR

registries, e.g. `docker pull gcr.io/project-id/my image`. Add `--verbosity=error` to silence this warning: `gcloud docker --verbosity=error -- pull gcr.io/project-id/my-image`.