Publish the android app on F-Droid

It would be nice to publish the android app on a FOSS app store like f-droid. It would make it much easier (I guess) to install it in countries where crypto is regulated (like France, where the app is not available in the play store).

No files, tests, or entry points are named. Start by identifying the Android app's release configuration and the metadata required by F-Droid, then confirm whether the current build can meet F-Droid's requirements. Done means the app is accepted and available through the F-Droid store.

Written by the indexing model from the issue text.