This container can be pulled via:
  docker pull registry.opensuse.org/devel/kubic/containers/container/opensuse/butane:0.29.0
  docker pull registry.opensuse.org/devel/kubic/containers/container/opensuse/butane:0.29.0-9.380
  docker pull registry.opensuse.org/devel/kubic/containers/container/opensuse/butane:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.