Do we want an automatic milestone closer action?

[bernhold]

When we started the "Ready for digest" column in our workflow, we also added monthly milestones. Right now, those milestones need to be closed manually when they're done. This is a housekeeping detail, and it is not like open but outdated milestones are very intrusive, so it may not really matter to us.

But I now have 2/3 of an automatic milestone closer action. Right now, the logic is as follows:

1. Find past-due milestones
2. For each past-due milestone, check whether it has any open issues associated with it
3. If there are no open issues, close the milestone

The missing piece is that in this context, we also need to check for open PRs (my use cases so far are issue-only repositories). I know how to do this in principle, but I'd have to implement it. It would probably take me a few hours.

So, do we want such an action?