kubernetes: Missing Kubernetes images in GCR, should be pushed on release

These docs says that one can pull Kubernetes images for each release from GCR:

https://github.com/GoogleCloudPlatform/kubernetes/blob/v1.0.1/docs/getting-started-guides/scratch.md

However, release images seem to be missing in GCR:

docker pull gcr.io/google_containers/kube-apiserver:v1.0.0
Pulling repository gcr.io/google_containers/kube-apiserver
FATA[0000] Tag v1.0.0 not found in repository gcr.io/google_containers/kube-apiserver

docker pull gcr.io/google_containers/kube-apiserver:v1.0.1
Pulling repository gcr.io/google_containers/kube-apiserver
FATA[0000] Tag v1.0.1 not found in repository gcr.io/google_containers/kube-apiserver

docker pull gcr.io/google_containers/kube-apiserver:1.0.1
Pulling repository gcr.io/google_containers/kube-apiserver
FATA[0000] Tag 1.0.1 not found in repository gcr.io/google_containers/kube-apiserver