This container can be pulled via:
  docker pull registry.opensuse.org/home/illuusio/images/images_15.6/gunicorn:15.6
  docker pull registry.opensuse.org/home/illuusio/images/images_15.6/gunicorn:19.7.1
  docker pull registry.opensuse.org/home/illuusio/images/images_15.6/gunicorn:19.7.1-4.22

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.