Trigger stale workflow on issue comments to remove stale label immediately

[yubiuser]

What does this PR aim to accomplish?:

We use the stale action to mark issues stale after 30 days of inactivity. The actions runs only once a day to mark stale issues. If updates to issues occur (e.g. comments) the action removes the stale label. However, this happens so far only once a day - in the worst case leaving a "gap" of 23:59 between comments and label removal.

This PR adds a trigger to the stale workflow to run on issue_commentso that new comments should remove the label immediately.

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[dschaper]

Will this both mark and unmark on every comment or just unmark on every comment?

[yubiuser]

As this triggers the whole workflow, it will also trigger marking issues as stale if they are due.

[PromoFaux]

I think running it on every issue_comment is overkill, and may even lead us into hitting rate limits on the Github API (1000 requests per hour per repo).. maybe not solely this, but in combination with other actions.

However, this happens so far only once a day - in the worst case leaving a "gap" of 23:59 between comments and label removal.

Does this cause an issue? We know that once a comment is added to an issue then next time the action runs the stale label will be removed.

How about instead just changing the schedule to be every n hours - with n to be decided. (But maybe 12?)

[yubiuser]

Does this cause an issue? We know that once a comment is added to an issue then next time the action runs the stale label will be removed.

It can be irritating for users if the label is not removed shortly after a new comment was added. I agree with
pi-hole/web#2534 (comment)

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We're not the getting that many comments... How about changing the workflow to not trigger the whole stale action but only removing the label if there is any?