Make GKE module cluster_name computed attribute

examples/simple_zonal_with_asm/main.tf

@@ -33,7 +33,7 @@ data "google_project" "project" {
 module "gke" {
   source                  = "../../"
   project_id              = var.project_id
-  name                    = "${local.cluster_type}-cluster${var.cluster_name_suffix}"
+  name                    = "test-prefix-cluster-test-suffix"
   regional                = false
   region                  = var.region
   zones                   = var.zones

outputs.tf

@@ -24,6 +24,16 @@ output "cluster_id" {
 output "name" {
   description = "Cluster name"
   value       = local.cluster_name
+  depends_on = [
+    /* Nominally, the cluster name is populated as soon as it is known to Terraform.
+    * However, the cluster may not be in a usable state yet.  Therefore any
+    * resources dependent on the cluster being up will fail to deploy.  With
+    * this explicit dependency, dependent resources can wait for the cluster
+    * to be up.
+    */
+    google_container_cluster.primary,
+    google_container_node_pool.pools,
+  ]
 }
 
 output "type" {