Create "sandbox" repository for new contributors #20
Description
We should have a repository that new contributors can use to create pull-requests on, to learn the contributing procedures. The "contributing guide" should use that repository in the examples (to prevent users from accidentally creating PRs against the "real" repositories).
Gordon/Leeroy can automatically respond to those PR's, and do fun things like "congratulate" them on a successful pull request, teach how to sign-off commits, rebase, etc.
For some background, see moby/moby#17330 (comment)