https://github.com/DeimosCloud/terraform-google-gke/blob/master/examples/gke-public-cluster/main.tf
https://github.com/terraform-google-modules/terraform-google-kubernetes-engine
https://github.com/Neutrollized/free-tier-gke/blob/master/terraform.tfvars.sample
https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/tree/master/examples/simple_autopilot_public