Configure GitHub for code review

[florentine-doemges]

One approver needed for merge into main.
Green Checks needed for merge into main

[florentine-doemges]

This is only allowed on public or paid repos: https://docs.github.com/en/repositories/configuring-branches-and-merges-in-your-repository/managing-protected-branches/managing-a-branch-protection-rule

So I am gonna close this until we are either public or paid