This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/factory/totest/containers/opensuse/tigervnc-x11vnc:1
  docker pull registry.opensuse.org/opensuse/factory/totest/containers/opensuse/tigervnc-x11vnc:1.16
  docker pull registry.opensuse.org/opensuse/factory/totest/containers/opensuse/tigervnc-x11vnc:1.16-3.28
  docker pull registry.opensuse.org/opensuse/factory/totest/containers/opensuse/tigervnc-x11vnc:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.