docker2podman: import ceph-handler role

This is needed to avoid following error:

```
ERROR! The requested handler 'restart ceph mons' was not found in either the main handlers list nor in the listening handlers list
```

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1777829

Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>

infrastructure-playbooks/docker-to-podman.yml

@@ -58,6 +58,8 @@
         name: ceph-defaults
     - import_role:
         name: ceph-facts
+    - import_role:
+        name: ceph-handler
 
     - name: get docker version
       command: docker --version

roles/ceph-handler/handlers/main.yml

@@ -1,6 +1,8 @@
 ---
 - name: handlers
-  when: not rolling_update | bool
+  when:
+     - not rolling_update | bool
+     - not docker2podman | default(False) | bool
   block:
     - name: update apt cache
       apt: