* Remove superfluous newline before Co-authored-by trailers
* Append to existing PR description trailer section
If the existing PR description message already contains a trailer section (e.g. Signed-off-by: ),
append to it instead of creating a new trailer section.
* Reuse compiled regexp
* Simplify regex and deal with trailing \n in PR description
* Add tests for CommitMessageTrailersPattern
- add support for Key:Value (no space after colon)
- add support for whitespace "folding"
* Update services/pull/pull_test.go
Co-authored-by: Norwin <noerw@users.noreply.github.com>
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: Norwin <noerw@users.noreply.github.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
