This container can be pulled via:
  docker pull registry.opensuse.org/isv/rancher/elemental/stable/teal53/media/rancher/elemental-teal-iso/5.3:1.1.5
  docker pull registry.opensuse.org/isv/rancher/elemental/stable/teal53/media/rancher/elemental-teal-iso/5.3:1.1.5-7.209
  docker pull registry.opensuse.org/isv/rancher/elemental/stable/teal53/media/rancher/elemental-teal-iso/5.3:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.