- Better labels upon an issue going stale will help triage better. There
other PRs with "needs update" that are manually put and therefore we
can't explicitly filter for stalebot.
- For management purposes, being able to view how many issues are
auto-closed helps as well.
* Replace probot/stale app with a Github Action
This creates a Github Actions workflow which seems to be the supported
way of automarking issues as stale. Adds a dry-run flag to test it out.
* small fixups
* cron typo
* disable unnecessary permissions
* use friendlier name
