This container can be pulled via:
  docker pull registry.opensuse.org/home/bmanojlovic/geo/containers/qgis-vnc-desktop:3.40.0
  docker pull registry.opensuse.org/home/bmanojlovic/geo/containers/qgis-vnc-desktop:3.40.0.18.1
  docker pull registry.opensuse.org/home/bmanojlovic/geo/containers/qgis-vnc-desktop:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.