Most of the posts here are about problems or solutions in building actions, but this forum is also for sharing Actions.
I released this action, BossBot, today. I made it because a team member on a project was replying using Outlook which doesn’t use the same email chain formatting that Github collapses.
This bot checks new issue comments for email-chain junk and removes it automatically. It’s useful even with Github hiding gmail-formatted chains. (I sometimes have had to go hunting for the "view this issue on github links just so I don’t further pollute the discussion with email chain content.)
Hope the action is useful for someone else trying to run a tight ship on their development issue comments and discussion.