This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/opensuse/fetchmail:6.4.38
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/opensuse/fetchmail:6.4.38-5.64
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/opensuse/fetchmail:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.