Export compute node ids

Accessible by calling module.nodes.id
 will return a list of compute node id
Mainly using for null-resource trigger

nodes/main.tf

@@ -32,4 +32,9 @@ resource "openstack_compute_instance_v2" "compute" {
   network {
     name = var.internal_network
   }
-}
\ No newline at end of file
+}
+
+# output
+output "id" {
+  value = openstack_compute_instance_v2.compute.*.id
+}