test-attaching volumes manually instead of for loop

ohpc-instance/main.tf

@@ -72,7 +72,7 @@ resource "openstack_compute_volume_attach_v2" "volume_attach" {
 }
 
 output "xdmod_instance_id" {
-  value = [for instance in openstack_compute_instance_v2.ohpc : instance.id]
+  value = openstack_compute_instance_v2.ohpc[0].id
 }
 
 output "ssh_host" {
@@ -80,5 +80,8 @@ output "ssh_host" {
 }
 
 output "device" {
-  value = [for volume in openstack_compute_volume_attach_v2.volume_attach : volume.device]
+  value = [
+    openstack_compute_volume_attach_v2.volume_attach[0].device,
+    openstack_compute_volume_attach_v2.volume_attach[1].device,
+  ]
 }