This container can be pulled via:
  docker pull registry.opensuse.org/isv/rancher/harvester/os/v1.8/main/baseos-headers:latest
  docker pull registry.opensuse.org/isv/rancher/harvester/os/v1.8/main/baseos-headers:v1.8

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.