fix: added subnetwork variable

Author: pawan1210

modules/frontend/variables.tf

@@ -162,11 +162,17 @@ variable "load_balancing_scheme" {
 }
 
 variable "network" {
-  description = "Network for INTERNAL_SELF_MANAGED load balancing scheme"
+  description = "Network for INTERNAL_SELF_MANAGED/INTERNAL_MANAGED load balancing scheme"
   type        = string
   default     = "default"
 }
 
+variable "subnetwork" {
+  description = "Subnetwork for INTERNAL_SELF_MANAGED/INTERNAL_MANAGED load balancing scheme"
+  type        = string
+  default     = null
+}
+
 variable "server_tls_policy" {
   description = "The resource URL for the server TLS policy to associate with the https proxy service"
   type        = string