This container can be pulled via:
  docker pull registry.opensuse.org/isv/rancher/elemental/teal53/15.4/rancher/elemental-node-image/5.3:21.1
  docker pull registry.opensuse.org/isv/rancher/elemental/teal53/15.4/rancher/elemental-node-image/5.3:latest
  docker pull registry.opensuse.org/isv/rancher/elemental/teal53/15.4/rancher/elemental-teal/5.3:21.1

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.