Gitea support

[qwc]

Is your feature request related to a problem? Please describe.

As a developer, I would like to use this package for my gitea projects.

Describe the solution you'd like

Basically the same features provided for GitHub where it's applicable.

Describe alternatives you've considered

There's almost no alternative which is independent and as feature-rich as intuit/auto...
For Golang projects it's possible to use goreleaser, maybe also for non go projects (I did not try), but I would rather use one tool than multiple different ones.
Especially none supports gitea.

Additional context

No additional context, just thanks for your work and that it would be amazing to have this for other git hosting providers aswell.