https://cloud.google.com/istio/docs/istio-on-gke/installing
https://cloud.google.com/kubernetes-engine/docs/tutorials/installing-istio#step_3_deploy_the_bookinfo_sample_application
$ gcloud beta container clusters create istio-demo \
--addons=Istio --istio-config=auth=MTLS_STRICT \
--cluster-version=latest \
--machine-type=n1-standard-2 \
--num-nodes=4 \
--zone=us-east1-b