common: enable crb repository on mgr hosts

This is needed in order to install `ceph-mgr-dashboard`
as it has a dependency on `python3-grpcio-tools` which comes from
crb repo.

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

roles/ceph-common/tasks/installs/redhat_community_repository.yml

@@ -7,6 +7,14 @@
   tags: with_pkg
   when: ansible_facts['distribution_major_version'] | int == 7
 
+- name: enable crb repository
+  ansible.builtin.yum_repository:
+    name: crb
+    enabled: yes
+  when:
+    - ansible_facts['distribution_major_version'] | int == 9
+    - inventory_hostname in groups[mgr_group_name]
+
 - name: configure red hat ceph community repository stable key
   rpm_key:
     key: "{{ ceph_stable_key }}"