This container can be pulled via:
  docker pull registry.opensuse.org/isv/rancher/elemental/pr/rancher/elemental-toolkit/pr-1906/containers/suse/sle-micro/base-5.5:2.1.0
  docker pull registry.opensuse.org/isv/rancher/elemental/pr/rancher/elemental-toolkit/pr-1906/containers/suse/sle-micro/base-5.5:2.1.0-65.4
  docker pull registry.opensuse.org/isv/rancher/elemental/pr/rancher/elemental-toolkit/pr-1906/containers/suse/sle-micro/base-5.5:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.