gcr.io as docker remote repository is not working

My use case is to add Google Cloud Container Registry for Kubernetes installation.

But I never succeed in configure gcr.io as a docker remote repository.
I just set URL: https://gcr.io
Am I missing something ?

I tried these docker pull commands:

docker pull docker-artifactory.sln.nc/google_containers/k8s-dns-sidecar-amd64:1.14.5
docker pull docker-artifactory.sln.nc/google-containers/k8s-dns-sidecar-amd64:1.14.5