This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/factory/totest/containers/opensuse/haproxy:3.1.1
  docker pull registry.opensuse.org/opensuse/factory/totest/containers/opensuse/haproxy:3.1.1-5.111
  docker pull registry.opensuse.org/opensuse/factory/totest/containers/opensuse/haproxy:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.