This container can be pulled via:
  docker pull registry.opensuse.org/home/illuusio/images/images_15.6/opensuse/ilmi/nextcloud:15.6
  docker pull registry.opensuse.org/home/illuusio/images/images_15.6/opensuse/ilmi/nextcloud:29.0.7
  docker pull registry.opensuse.org/home/illuusio/images/images_15.6/opensuse/ilmi/nextcloud:29.0.7-3.8

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.