@tom79 Having your own official F-Droid repo at e.g. https://fdroid.fedilab.app/ would be great!
If you need help/advice, feel free to join #fdroid-dev via either IRC or Matrix: https://staging.f-droid.org/about/
There's also the forum where you can ask questions: https://forum.f-droid.org/
The docs contain a lot of useful information: https://f-droid.org/en/docs/
Setup an F-Droid Repo: https://f-droid.org/en/docs/Setup_an_F-Droid_App_Repo/
Publishing Nightly Builds with GitLab CI: https://f-droid.org/en/docs/Publishing_Nightly_Builds/