This container can be pulled via:
  docker pull registry.opensuse.org/home/pushman/bci/cr/tumbleweed/containerfile/opensuse/bci/ruby:4
  docker pull registry.opensuse.org/home/pushman/bci/cr/tumbleweed/containerfile/opensuse/bci/ruby:4.0
  docker pull registry.opensuse.org/home/pushman/bci/cr/tumbleweed/containerfile/opensuse/bci/ruby:4.0-1.12
  docker pull registry.opensuse.org/home/pushman/bci/cr/tumbleweed/containerfile/opensuse/bci/ruby:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.