This container can be pulled via:
  docker pull registry.opensuse.org/isv/rancher/elemental/maintenance/5.5/containers/suse/sle-micro/5.5:2.0.4
  docker pull registry.opensuse.org/isv/rancher/elemental/maintenance/5.5/containers/suse/sle-micro/5.5:2.0.4-5.229
  docker pull registry.opensuse.org/isv/rancher/elemental/maintenance/5.5/containers/suse/sle-micro/5.5:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.