This container can be pulled via:
  docker pull registry.opensuse.org/home/pushman/bci/cr/16.0/containerfile/bci/ruby:3
  docker pull registry.opensuse.org/home/pushman/bci/cr/16.0/containerfile/bci/ruby:3.4
  docker pull registry.opensuse.org/home/pushman/bci/cr/16.0/containerfile/bci/ruby:3.4-1.21

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.