terraform/gcp: Allow to change extra disk types (#8524)

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

@@ -31,6 +31,10 @@ variable "master_preemptible" {
   type = bool
 }
 
+variable "master_additional_disk_type" {
+  type = string
+}
+
 variable "worker_sa_email" {
   type = string
 }
@@ -43,6 +47,10 @@ variable "worker_preemptible" {
   type = bool
 }
 
+variable "worker_additional_disk_type" {
+  type = string
+}
+
 variable "ssh_pub_key" {}
 
 variable "ssh_whitelist" {