This container can be pulled via:
  docker pull registry.opensuse.org/home/dirkmueller/bci/cr/sle-15-sp5/containerfile/bci/ruby:2
  docker pull registry.opensuse.org/home/dirkmueller/bci/cr/sle-15-sp5/containerfile/bci/ruby:2-1.207
  docker pull registry.opensuse.org/home/dirkmueller/bci/cr/sle-15-sp5/containerfile/bci/ruby:2.5
  docker pull registry.opensuse.org/home/dirkmueller/bci/cr/sle-15-sp5/containerfile/bci/ruby:2.5-1.207
  docker pull registry.opensuse.org/home/dirkmueller/bci/cr/sle-15-sp5/containerfile/bci/ruby:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.