This container can be pulled via:
  docker pull registry.opensuse.org/devel/bci/sle-15-sp6/containerfile/containers/apache-tomcat:9-openjdk8
  docker pull registry.opensuse.org/devel/bci/sle-15-sp6/containerfile/containers/apache-tomcat:9.0.91-openjdk8
  docker pull registry.opensuse.org/devel/bci/sle-15-sp6/containerfile/containers/apache-tomcat:9.0.91-openjdk8-61.1

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.