added support for global proxy only subnets

modules/net-vpc/README.md

@@ -287,6 +287,8 @@ Along with common private subnets module supports creation more service specific
 - [Proxy-only subnets](https://cloud.google.com/load-balancing/docs/proxy-only-subnets) for Regional HTTPS Internal HTTPS Load Balancers
 - [Private Service Connect](https://cloud.google.com/vpc/docs/private-service-connect#psc-subnets) subnets
 
+- [Global Proxy-only subnet] (https://cloud.google.com/load-balancing/docs/proxy-only-subnets#envoy-lb) with purpose for Cross-region internal Application Load Balancers
+
 ```hcl
 module "vpc" {
   source     = "./fabric/modules/net-vpc"
@@ -308,6 +310,14 @@ module "vpc" {
       region        = "europe-west1"
     }
   ]
+  subnets_global_proxy_only = [
+    {
+      ip_cidr_range = "10.0.4.0/24"
+      name          = "global-proxy"
+      region        = "australia-southeast2"
+      active        = true
+    }
+  ]
 }
 # tftest modules=1 resources=5 inventory=proxy-only-subnets.yaml
 ```