Add support for Gogs

[rybak]

Overview

Development of Gogs is done on GitHub. A public-ish mirror is available at https://try.gogs.io/gogs/gogs. Gitea and Forgejo are forks of Gogs.

Public instances

• https://try.gogs.io
  • Unfortunately, even the explore tab requires an account. Thankfully, the registration is open.

Example URLs for testing

• Regular commit: https://try.gogs.io/gogs/gogs/commit/1112a71ea5279a29666d54f07ef101480519fd16
• Commit without body in the commit message: https://try.gogs.io/gogs/gogs/commit/3be3ae500b4b4792db94f4a8d46943b783400681
• Tagged commit:
• Commit at the tip of a branch:
• Commit with issue number in the subject line: https://try.gogs.io/andrybak/copy-commit-reference-userscript/commit/a227145e015904bcc9dea3855fbd4a2297bef9b9
• Commit with PR number in the subject line:

Screenshot

The button should be placed to the left of the "Browse Source" button, similar to implementation for GitHub and Gitea: