- always use github runners for lightweight jobs
- prefer self-hosted runners in private forks
- prefer self-hosted runners for workflows with large matrix
We are interested in using stale actions only for issues, and
currently there's no clear/clean way of making it not enumerate pull
requests. As a workaround, we attempt to minimize the number of
operations spent on pull requests by making it run only on pull
requests which have an inexistent tag, thus skipping all PRs.