Add missing required argument.

terraform/main.tf

@@ -68,6 +68,7 @@ resource "google_container_cluster" "primary" {
   // In a private cluster, the master has two IP addresses, one public and one
   // private. Nodes communicate to the master through this private IP address.
   private_cluster_config {
+    enable_private_endpoint = false
     enable_private_nodes   = true
     master_ipv4_cidr_block = "10.0.90.0/28"
   }