knative install手順
code:gcloud
gcloud beta container clusters create k8s \
--addons=Istion --machine-type=n1-standard-2 \
--num-node=4
kubectl create clusterrolebinding cluster-admin-binding \
--clusterrole=cluster-admin \
--user=$(gcloud config get-value core/account)
kubectl apply --selector knative.dev/crd-install=true \