This container can be pulled via:
  docker pull registry.opensuse.org/isv/rancher/elemental/staging/teal53/media/rancher/elemental-teal-rt-channel/5.3:1.1.4
  docker pull registry.opensuse.org/isv/rancher/elemental/staging/teal53/media/rancher/elemental-teal-rt-channel/5.3:1.1.4-2.21
  docker pull registry.opensuse.org/isv/rancher/elemental/staging/teal53/media/rancher/elemental-teal-rt-channel/5.3:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.