This container can be pulled via:
  docker pull registry.opensuse.org/devel/bci/sle-15-sp6/containerfile/bci/ruby:2
  docker pull registry.opensuse.org/devel/bci/sle-15-sp6/containerfile/bci/ruby:2.5
  docker pull registry.opensuse.org/devel/bci/sle-15-sp6/containerfile/bci/ruby:2.5-227.1
  docker pull registry.opensuse.org/devel/bci/sle-15-sp6/containerfile/bci/ruby:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.