Container Support

Ticket moved to GitHub: "pulp/pulp_container/459":https://github.com/pulp/pulp_container/issues/459

I open this feature request after a short conversation on the mailing list: see the "pulp_docker: whitelist upstreams" thread.

I would like to be able to provide a list of whitelisted upstreams and create a single repository version with all of these upstreams. For example, I would like for users to be able to do:

docker pull my_docker_distribution/alpine/git
docker pull my_docker_distribution/postgresql

but not

docker pull my_docker_distribution/super_shady_container_image_hosted_on_Docker_Hub

where the underlying repositories would point to Docker Hub, or other container registries.

Thank you for any information!