This container can be pulled via:
  docker pull registry.opensuse.org/devel/bci/tumbleweed/containerfile/opensuse/rmt-server:2.18
  docker pull registry.opensuse.org/devel/bci/tumbleweed/containerfile/opensuse/rmt-server:2.18-255.28
  docker pull registry.opensuse.org/devel/bci/tumbleweed/containerfile/opensuse/rmt-server:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.