fix(worker): Adjust server-type to cx21-ceph

terraform/main.tf

@@ -41,6 +41,6 @@ module "workers" {
   }
   placement_group_id = hcloud_placement_group.k8s.id
   ssh_keys           = data.hcloud_ssh_keys.all_keys.ssh_keys.*.name
-  server_type        = "cx21"
+  server_type        = "cx21-ceph"
   user_data          = file("templates/cloud-init.tpl")
 }