Enable the use of Codeberg releases.

Hey :),

I would like to see software from Codeberg (Codeberg.org, a non-profit Forgejo instance) also allowed.

At first glance, the paths look like there's no difference between GitHub and Codeberg.

```
Current Codeberg release:
https://codeberg.org/SebastianRzk/Looksyk/releases/download/v1.22.2/Looksyk-x86_64.AppImage

Last GitHub release:
https://github.com/SebastianRzk/Looksyk/releases/download/v1.20.2/Looksyk-x86_64.AppImage
```

I also tried linking the AppImages directly, but that didn't work either (here's my build: https://github.com/AppImage/appimage.github.io/actions/runs/23635401194/job/68843483518)

I understand that not all possible Git instances are supported, but I would also appreciate a European option like Codeberg!

(And I also didn't read in the Readme that GitHub is a mandatory requirement).