This container can be pulled via:
  docker pull registry.opensuse.org/kernel/tools/images/sle_12_sp5/nettest:12.5
  docker pull registry.opensuse.org/kernel/tools/images/sle_12_sp5/nettest:12.5.7.121
  docker pull registry.opensuse.org/kernel/tools/images/sle_12_sp5/nettest:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.