terraform: Disable IPv6 entires for nodes

terraform/main.tf

@@ -23,6 +23,7 @@ module "nodes" {
   server_type    = "cx21"
   # subnet         = hcloud_network_subnet.subnet.id
   user_data      = file("templates/cloud-init.tpl")
+  enable_IPv6    = false
 }
 
 module "workers" {