add ansible to stage composer for container rebuild automation testing

Signed-off-by: Adam Miller <admiller@redhat.com>

playbooks/groups/releng-compose.yml

@@ -80,5 +80,11 @@
       state: latest
     when: ansible_architecture != "ppc64"
 
+  - name: install ansible for container automated rebuilds
+    package:
+      name: ansible
+      state: latest
+    when: env == "staging" and ansible_architecture != "ppc64"
+
   handlers:
   - import_tasks: "{{ handlers_path }}/restart_services.yml"