Update nightlybuild.yml

Author: bertiethorpe

.github/workflows/nightlybuild.yml

@@ -27,7 +27,7 @@ jobs:
           - RL8
           - RL9
         build:
-          - openstack.rocky-latest
+          - openstack.rocky-latest-test
     env:
       ANSIBLE_FORCE_COLOR: True
       OS_CLOUD: openstack