You should check out .gitignore templates and .gitignore file in other open source Android apps to see what needs to be published, what doesn't need to be published, and most importantly what you should not publish. You should get a couple of results when you search "gitignore android studio".

Codeberg or gitlab as a source forge. Depending on how private you are, you can start a fresh git repository, then your private history won't be exposed.

Otherwise, a license and gitignore file and you're done. Maybe a README if you fancy. And if you want to go overboard, add the apk or request for it to be put on F-Droid

@ByteMe Look at publishing it on #fdroid @fdroidorg may be of help.

Look in to what license fits your project best.

commit AGENT.md so we'd know if it was AI assisted 👀