[Cephadm] Adding Ceph daemons fails with the error "unauthorized: authentication required" on newly added hosts with custom registry.

Issue

• How to add ceph daemons on newly added hosts with custom registry?
• Adding ceph daemon on newly added hosts using custom registry fails with the error "unauthorized: authentication required"

• The following warning shows in ceph health detail output:

  Raw

  [WRN] CEPHADM_REFRESH_FAILED: failed to probe daemons or devices
  host private-registry.example.com `cephadm ceph-volume` failed: cephadm exited with an error code: 1, stderr:Non-zero exit code 125 from /bin/podman run --rm --ipc=host --net=host --entrypoint stat --init -e CONTAINER_IMAGE=ceph5-2-1-registry.example.com:5000/rhceph/rhceph-5-rhel8@sha256:d42c0d99ddeaa001570dce4eb90b71699e0401fe449966b935f669ffad22bd01 -e NODE_NAME=private-registry.example.com -e CEPH_USE_RANDOM_NONCE=1 ceph5-2-1-registry.example.com:5000/rhceph/rhceph-5-rhel8@sha256:d42c0d99ddeaa001570dce4eb90b71699e0401fe449966b935f669ffad22bd01 -c %u %g /var/lib/ceph
  stat: stderr Trying to pull ceph5-2-1-registry.example.com:5000/rhceph/rhceph-5-rhel8@sha256:d42c0d99ddeaa001570dce4eb90b71699e0401fe449966b935f669ffad22bd01...
  stat: stderr Error: initializing source docker://ceph5-2-1-registry.example.com:5000/rhceph/rhceph-5-rhel8@sha256:d42c0d99ddeaa001570dce4eb90b71699e0401fe449966b935f669ffad22bd01: reading manifest sha256:d42c0d99ddeaa001570dce4eb90b71699e0401fe449966b935f669ffad22bd01 in ceph5-2-1-registry.example.com:5000/rhceph/rhceph-5-rhel8: unauthorized: authentication required
  

• How to eliminate this warning?