Add some debug so we can see what ansible_play_hosts and ansible_play_hosts_all look like

Author: maxstack

etc/kayobe/ansible/stackhpc-cloud-tests.yml

@@ -168,6 +168,12 @@
             # For jump host
             use_ssh_args: true
 
+        - name: A bit of debug
+          ansible.builtin.debug:
+            msg:
+              - "ansible_play_hosts_all: {{ ansible_play_hosts_all }}"
+              - "ansible_play_hosts: {{ ansible_play_hosts }}"
+
         - name: Write a file containing failed test runs
           ansible.builtin.copy:
             content: |-