Auto-request reviews for parts of repository (CODEOWNERS)

[lubianat]

This adds two files:

• `‎.github/workflows/request-reviewers.yml, which triggers an action to auto manage reviewers for new PRs
• .github/reviewers.yml the configuration file for that action

A custom action (pinned to a commit) is used because the native mechanism is too rigid (e.g. it requires write permissions to assign someone as a reviewer)

Authors of RFC (surely the corresponding authors) could be auto-notified of changes to their part of the repository.

Additionally, it could allow for ownership of parts of the documentation

"owners" don't get any special right; they just get a review request any time a PR that touches that path is opened.

[github-actions]

Automated Review URLs

• Readthedocs

[joshmoore]

Thanks, @lubianat! Very happy to try something like this out. FMPOV, I think I'd be happy to be added to rfc/ and specifications/ though being aware of the noise, maybe not :) An alternative for the GerBI team would be to make sure we have all the subdirectories covered, and then we can always add each other.

[lubianat]

Thank you!

I will study https://github.com/marketplace/actions/auto-request-review as an option for this PR. It looks equally simple and better managed.

I can add you to the two groups if that would reduce noise e.g. ignoring PRs that are pure docs, depending on your notification configs.

Generally: happy to add anyone to any review group upon (pull) request. No special permissions are granted, so it is safe.

[lubianat]

Sorry for dismissing your review, @joshmoore .

I've changed it to use auto-request-review; it is more popular and more actively maintained, plus seems to have just the right amount of features.