This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/factory/arm/totest/containers/opensuse/spamassassin:3.4.6
  docker pull registry.opensuse.org/opensuse/factory/arm/totest/containers/opensuse/spamassassin:3.4.6-5.221
  docker pull registry.opensuse.org/opensuse/factory/arm/totest/containers/opensuse/spamassassin:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.