This container can be pulled via:
  docker pull registry.opensuse.org/isv/rancher/elemental/staging/teal53/15.4/rancher/elemental-teal-channel:1.3.1
  docker pull registry.opensuse.org/isv/rancher/elemental/staging/teal53/15.4/rancher/elemental-teal-channel:1.3.1-18.21
  docker pull registry.opensuse.org/isv/rancher/elemental/staging/teal53/15.4/rancher/elemental-teal-channel:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.