Support "^" character is compare API to designate previous commits

[ybizeul]

Feature Description

GitHub API lets you compare commits with a special trick to target the previous commit by using the ^ character, it is described here : https://docs.github.com/en/pull-requests/committing-changes-to-your-project/viewing-and-comparing-commits/comparing-commits#comparisons-across-commits

When using this syntax, Gitea returns :

{"errors":null,"message":"The target couldn't be found.","url":"https://gitea.mydomain.com/api/swagger"}

Because of that, things like https://github.com/marketplace/actions/release-changelog-builder don't work, and their specific support for gitea repositories is broken so it's totally unusable.

Screenshots

No response

[lunny]

#32786 should resolve this problem

[ybizeul]

Any hope that it’ll be merged ?