Add support for Forgejo

[rybak]

Overview

Forgejo is a fork of Gitea, with their own commits being continuously rebased on top of Gitea. Unlike Gitea, which is hosted on GitHub (they are working toward self-hosting, see pinned issues), Forgejo seems to be self-hosted: https://codeberg.org/forgejo/forgejo, since Codeberg runs Forgejo.

This was initially tracked under #4.

Public instances

• https://codeberg.org
  • Self-hosted: https://codeberg.org/forgejo/forgejo
• https://git.disroot.org/

Example URLs for testing

• Regular commit: https://codeberg.org/forgejo/forgejo/commit/d63c5b18a78ecf6a57e2d479b7a9d968feff68c9
• Commit without body in the commit message: https://codeberg.org/forgejo/forgejo/commit/f578279cfe85d4e23b83d3759ec782790fed869d
• Tagged commit: https://codeberg.org/forgejo/forgejo/commit/b63df8b5c491729f557fd8076b44f9df1d00eec1
  • No special handling needed, tag is out of the way of the commit message.
• Commit at the tip of a branch: https://codeberg.org/forgejo/forgejo/commits/branch/forgejo
• Commit with issue number in the subject line: https://codeberg.org/forgejo/forgejo/commit/e35d92de1f37bea0a593093678f093845955e3fc
• Commit with PR number in the subject line: https://codeberg.org/forgejo/forgejo/commit/a4369782e1cfbbc6f588c0cda5776ee823b0e493

Screenshot

The button should be added to the left of "Browse Source", same as for Gitea, similar to GitHub.