add flatcar support for Hetzner (#9618)

contrib/terraform/hetzner/main.tf

@@ -2,6 +2,7 @@ provider "hcloud" {}
 
 module "kubernetes" {
   source = "./modules/kubernetes-cluster"
+  #source = "./modules/kubernetes-cluster-flatcar"
 
   prefix = var.prefix
 
@@ -9,6 +10,9 @@ module "kubernetes" {
 
   machines = var.machines
 
+  #only for flatcar
+  #ssh_private_key_path = var.ssh_private_key_path
+
   ssh_public_keys = var.ssh_public_keys
   network_zone = var.network_zone
 
@@ -49,4 +53,4 @@ resource "null_resource" "inventories" {
   triggers = {
     template = data.template_file.inventory.rendered
   }
-}
+}