This container can be pulled via:
  docker pull registry.opensuse.org/home/dirkmueller/branches/devel/bci/sle-15-sp6/images/bci/bci-base:15.6
  docker pull registry.opensuse.org/home/dirkmueller/branches/devel/bci/sle-15-sp6/images/bci/bci-base:15.6.2.33
  docker pull registry.opensuse.org/home/dirkmueller/branches/devel/bci/sle-15-sp6/images/suse/sle15:15.6
  docker pull registry.opensuse.org/home/dirkmueller/branches/devel/bci/sle-15-sp6/images/suse/sle15:15.6.2.33

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.