This container can be pulled via:
  docker pull registry.opensuse.org/home/nbelouin/factorynmctest/images/frr:8.5.6
  docker pull registry.opensuse.org/home/nbelouin/factorynmctest/images/frr:8.5.6-1.15

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.