This container can be pulled via:
  docker pull registry.opensuse.org/home/vlefebvre/branches/opensuse/templates/images/tumbleweed/containers/opensuse/rpm-sysusers:4.20.1
  docker pull registry.opensuse.org/home/vlefebvre/branches/opensuse/templates/images/tumbleweed/containers/opensuse/rpm-sysusers:4.20.1.16.1
  docker pull registry.opensuse.org/home/vlefebvre/branches/opensuse/templates/images/tumbleweed/containers/opensuse/rpm-sysusers:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.