Setup centralisation of branch protection rules for all repos

[dhruvkb]

Problem

All repositories are currently managing their own branch protection rules. Based on needs such as pushing to GH pages or allowing force-push to one's one branches but not master can cause these rules to diverge from each other as well as from the ideal configuration.

Description

These rules should be defined in this repository and synced to all downstream repositories so that we have a consistent set of rules everywhere.

Additional context

This sort of work has been done earlier. Refer to this implementation by CC for example.

Implementation

• 🙋 I would be interested in implementing this feature.

[sarayourfriend]

This would be mostly unnecessary with #336, at least in the longer term.

It is also a duplicate of an infrastructure issue we have to move all branch protection rules into Terraform. I'd prefer if we had the rules in Terraform, even if it's only for a single repository, mostly so that the changes are reviewed as appropriate. If the monorepo RFC goes through, @dhruvkb should we close this issue?

[dhruvkb]

We should close this as a duplicate of https://github.com/WordPress/openverse-infrastructure/issues/173. The monorepo will eventually merge everything but for now it excludes the infra and catalog repos so this feature will still be useful.