This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/opensuse/bci/ruby:4.0-micro
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/opensuse/bci/ruby:4.0-micro-8.8

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.