This container can be pulled via:
  docker pull registry.opensuse.org/network/samba/containers/containers/opensuse/samba-server:4.21
  docker pull registry.opensuse.org/network/samba/containers/containers/opensuse/samba-server:4.21.0
  docker pull registry.opensuse.org/network/samba/containers/containers/opensuse/samba-server:4.21.0-15.1105
  docker pull registry.opensuse.org/network/samba/containers/containers/opensuse/samba-server:latest