Create bot action to run formatter and link checker

[chalin]

A good number of contributors submit PRs through the GH web i/f. It would be nice if we could support them by offering a bot action that would run the formatter and the link checker (to update the refcache) and submit a commit, possibly triggered by an in-comment command like /format or something more general like /run-checks

I don't know what would be involved in setting this up, but I wanted to get a discussion started.

/cc @cartermp @svrnm @trask

[cartermp]

Yeah I think that'd be a great thing to help contributors.

[theletterf]

Has this been solved by /fix:all?

[chalin]

Yes, the various /fix directives that are in place address this. Closing.