ceph dashboard uses radosgw-admin for certain tasks that aren't accessible via the rgw REST API. Due to the absence of a valid ceph.conf file at /etc/ceph/ceph.conf within the mgr pod, radosgw-admin fails to operate, resulting in 500 errors across various 'Object Gateway' views on the dashboard. This change adds CEPH_ARGS environment variable to the mgr pod enabling its propagation and utilization by the dashboard/radosgw-admin for executing rgw commands. closes: https://github.com/rook/rook/issues/13255 Signed-off-by: Redouane Kachach <rkachach@redhat.com>