This PR adds a button to allow quickly clearing the merge message of a
PR. The button will remove everything but the git trailers.
I found myself often pruning the commit message before merging,
especially for PRs generated by renovate - renovate puts a very long and
detailed comment with the full changelog in each PR it opens. This
clutters the commit message. However, I want to explicitly preserve the
git commit trailers. Doing this manually works, but having a button is a
lot easier.
Screenshot:
![image](https://user-images.githubusercontent.com/13721712/197337525-d456d0f8-1f7c-43a9-815d-ca93b1e7a90a.png)
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: delvh <dev.lh@web.de>