This container can be pulled via:
  docker pull registry.opensuse.org/devel/bci/16.0/containerfile/suse/stunnel:5
  docker pull registry.opensuse.org/devel/bci/16.0/containerfile/suse/stunnel:5.74
  docker pull registry.opensuse.org/devel/bci/16.0/containerfile/suse/stunnel:5.74-2.22

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.