This container can be pulled via:
  docker pull registry.opensuse.org/isv/rancher/elemental/pr/rancher/elemental-toolkit/pr-1971/containers/suse/sle-micro/kvm-5.5:2.1.0
  docker pull registry.opensuse.org/isv/rancher/elemental/pr/rancher/elemental-toolkit/pr-1971/containers/suse/sle-micro/kvm-5.5:2.1.0-2.29
  docker pull registry.opensuse.org/isv/rancher/elemental/pr/rancher/elemental-toolkit/pr-1971/containers/suse/sle-micro/kvm-5.5:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.