This container can be pulled via:
  docker pull registry.opensuse.org/isv/rancher/elemental/pr/rancher/elemental/pr-1404/containers/suse/sl-micro/6.0/base-iso-image:2.1.0
  docker pull registry.opensuse.org/isv/rancher/elemental/pr/rancher/elemental/pr-1404/containers/suse/sl-micro/6.0/base-iso-image:2.1.0-61.7
  docker pull registry.opensuse.org/isv/rancher/elemental/pr/rancher/elemental/pr-1404/containers/suse/sl-micro/6.0/base-iso-image:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.