This container can be pulled via:
  docker pull registry.opensuse.org/devel/unifiedcore/tumbleweed/prs/dirkmueller/elemental/pr-1/containers/release-manifest:0-8.1
  docker pull registry.opensuse.org/devel/unifiedcore/tumbleweed/prs/dirkmueller/elemental/pr-1/containers/release-manifest:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.