Add some traceability info to official repositories/images

[olberger]

One should be able to trace, from the docker index, the source of the official images, how they have been made, who's responsible, and how to report issues.

A use case, for instance, is how to report that an official image for Debian must be made for the latest update of the stable distribution... One should be able to contact the maintainer, and eventually file an issue at the proper repo.

In that case, I'd expect to be able to navigate from https://index.docker.io/_/debian/ to https://github.com/tianon/docker-brew-debian

You may find some related discussion in moby/moby#769 although I think that something more formal than textual description is needed in that case.

Hope this helps.

[yosifkit]

Sorry this is a slow reply, but we are currently working to make the hub more easily connected to the source and that hub descriptions for official images will contain an "Issues and contributing" section.

[yosifkit]

This is done!