This container can be pulled via:
  docker pull registry.opensuse.org/devel/sap/trento/factory/charts/trento/trento-server:3.1.9
  docker pull registry.opensuse.org/devel/sap/trento/factory/charts/trento/trento-server:3.1.9-build208.1

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.