contrib/terraform/gcp: allow extra ingress firewalls (#9658)

Signed-off-by: Mathieu Parent <math.parent@gmail.com>

Signed-off-by: Mathieu Parent <math.parent@gmail.com>

contrib/terraform/gcp/modules/kubernetes-cluster/variables.tf

@@ -14,7 +14,7 @@ variable "machines" {
     }))
     boot_disk = object({
       image_name = string
-      size = number
+      size       = number
     })
   }))
 }
@@ -73,3 +73,14 @@ variable "ingress_whitelist" {
 variable "private_network_cidr" {
   default = "10.0.10.0/24"
 }
+
+variable "extra_ingress_firewalls" {
+  type = map(object({
+    source_ranges = set(string)
+    protocol      = string
+    ports         = list(string)
+    target_tags   = set(string)
+  }))
+
+  default = {}
+}