add example skeleton

examples/gke/gke_impersonate/main.tf

@@ -0,0 +1,20 @@
+locals {
+  service_account_id    = "castai-gke-tf-${substr(sha1(var.cluster_name), 0, 8)}"
+}
+
+resource "google_service_account" "client_service_account" {
+  account_id   = local.service_account_id
+  display_name = "Service account to manage ${var.cluster_name} cluster via CAST"
+  project      = var.project_id
+}
+
+resource "castai_gke_cluster" "this" {
+  project_id                 = var.project_id
+  location                   = var.cluster_region
+  name                       = var.cluster_name
+  delete_nodes_on_disconnect = var.delete_nodes_on_disconnect
+
+  # provide client service account to cluster
+  client_service_account = google_service_account.client_service_account.email
+  cast_service_account = ""
+}

examples/gke/gke_impersonate/variables.tf

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+variable "project_id" {
+  type        = string
+  description = "GCP project ID in which GKE cluster is located."
+}
+
+variable "cluster_name" {
+  type        = string
+  description = "GKE cluster name in GCP project."
+}
+
+variable "cluster_region" {
+  type        = string
+  description = "Region of the cluster to be connected to CAST AI."
+}
+
+variable "subnets" {
+  type        = list(string)
+  description = "Subnet IDs used by CAST AI to provision nodes."
+}
+
+variable "delete_nodes_on_disconnect" {
+  type        = bool
+  description = "Optionally delete Cast AI created nodes when the cluster is destroyed."
+  default     = false
+}
+
+variable "castai_api_token" {
+  type        = string
+  description = "CAST AI API token created in console.cast.ai API Access keys section."
+}
+
+variable "castai_api_url" {
+  type        = string
+  description = "CAST AI api url."
+  default     = "https://api.cast.ai"
+}
+