This container can be pulled via:
  docker pull registry.opensuse.org/home/favogt/flatpakpoc/container/app/org.opensuse.qpdfview/x86_64:20200331
  docker pull registry.opensuse.org/home/favogt/flatpakpoc/container/app/org.opensuse.qpdfview/x86_64:20200331.65.14
  docker pull registry.opensuse.org/home/favogt/flatpakpoc/container/app/org.opensuse.qpdfview/x86_64:master

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.