This container can be pulled via:
  docker pull registry.opensuse.org/home/defolos/bci/cr/sle-15-sp6/containerfile/bci/ruby:2
  docker pull registry.opensuse.org/home/defolos/bci/cr/sle-15-sp6/containerfile/bci/ruby:2.5
  docker pull registry.opensuse.org/home/defolos/bci/cr/sle-15-sp6/containerfile/bci/ruby:2.5-30.11
  docker pull registry.opensuse.org/home/defolos/bci/cr/sle-15-sp6/containerfile/bci/ruby:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.