This container can be pulled via:
  docker pull registry.opensuse.org/devel/bci/sle-15-sp7/containerfile/suse/rmt-server:2.18
  docker pull registry.opensuse.org/devel/bci/sle-15-sp7/containerfile/suse/rmt-server:2.18-53.6

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.