This container can be pulled via:
  docker pull registry.opensuse.org/isv/rancher/elemental/pr/rancher/elemental/pr-1452/containers/suse/sl-micro/6.0/kvm-iso-image:2.2.0
  docker pull registry.opensuse.org/isv/rancher/elemental/pr/rancher/elemental/pr-1452/containers/suse/sl-micro/6.0/kvm-iso-image:2.2.0-87.6
  docker pull registry.opensuse.org/isv/rancher/elemental/pr/rancher/elemental/pr-1452/containers/suse/sl-micro/6.0/kvm-iso-image:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.