rgw: ability to copy ceph admin key on containerized

If we now set copy_admin_key while running a containerized scenario, the
ceph admin key will be copied on the node.

Signed-off-by: Sébastien Han <seb@redhat.com>

roles/ceph-rgw/tasks/docker/copy_configs.yml

@@ -1,9 +1,22 @@
 ---
-- name: set config and keys paths
+- name: set_fact admin_keyring
+  set_fact:
+    admin_keyring:
+      - "/etc/ceph/{{ cluster }}.client.admin.keyring"
+  when:
+    - copy_admin_key
+
+- name: set_fact ceph_config_keys
   set_fact:
     ceph_config_keys:
       - /var/lib/ceph/bootstrap-rgw/{{ cluster }}.keyring
 
+- name: merge ceph_config_keys and admin_keyring
+  set_fact:
+    ceph_config_keys: "{{ ceph_config_keys + admin_keyring }}"
+  when:
+    - copy_admin_key
+
 - name: stat for ceph config and keys
   local_action:
     module: stat