This container can be pulled via:
  docker pull registry.opensuse.org/home/dcassany/branches/isv/rancher/elemental/staging/containers/rancher/elemental-teal/5.4:1.2.2
  docker pull registry.opensuse.org/home/dcassany/branches/isv/rancher/elemental/staging/containers/rancher/elemental-teal/5.4:1.2.2-15.12
  docker pull registry.opensuse.org/home/dcassany/branches/isv/rancher/elemental/staging/containers/rancher/elemental-teal/5.4:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.