This container can be pulled via:
  docker pull registry.opensuse.org/isv/rancher/elemental/teal52/15.3/rancher/elemental-builder-image:6.63
  docker pull registry.opensuse.org/isv/rancher/elemental/teal52/15.3/rancher/elemental-builder-image:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.