This container can be pulled via:
  docker pull registry.opensuse.org/home/trenn/branches/opensuse/templates/images/tumbleweed/containers/opensuse/vsftp:3.0.5
  docker pull registry.opensuse.org/home/trenn/branches/opensuse/templates/images/tumbleweed/containers/opensuse/vsftp:3.0.5.5.1
  docker pull registry.opensuse.org/home/trenn/branches/opensuse/templates/images/tumbleweed/containers/opensuse/vsftp:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.