add workload identity support to beta-private-cluster

Author: sylvio.pedroza

modules/beta-private-cluster/cluster_regional.tf

@@ -173,6 +173,10 @@ resource "google_container_cluster" "primary" {
       state    = database_encryption.value.state
     }
   }
+
+  workload_identity_config {
+    identity_namespace = var.identity_namespace
+  }
 }
 
 /******************************************

modules/beta-private-cluster/cluster_zonal.tf

@@ -169,6 +169,10 @@ resource "google_container_cluster" "zonal_primary" {
       state    = database_encryption.value.state
     }
   }
+
+  workload_identity_config {
+    identity_namespace = var.identity_namespace
+  }
 }
 
 /******************************************

modules/beta-private-cluster/variables.tf

@@ -373,3 +373,9 @@ variable "enable_vertical_pod_autoscaling" {
   description = "Vertical Pod Autoscaling automatically adjusts the resources of pods controlled by it"
   default     = false
 }
+
+variable "identity_namespace" {
+  type        = string
+  description = "Workload Identity namespace"
+  default     = ""
+}