This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/opensuse/rmt-server:2.18
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/opensuse/rmt-server:2.18-28.6
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/opensuse/rmt-server:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.