Provide `.APK`s via `/Releases` tab.

[RokeJulianLockhart]

My rationale is available at MycroftAI/Mycroft-Android#107 (comment), which states:

Precompiled versions aren't provided in any form, and I will never bother to compile this for myself constantly. It also allows those who use something like https://f-droid.org/en/packages/net.xzos.upgradeall/ to update this package without having to use https://play.google.com or https://f-droid.org.

Additionally, this would at least allow repositories such as IzzySoft's to serve the software until this is added to the primary F-Droid repository.

Relevant to #152.

[liluzibird]

There are only a handful of reasons why someone would use and pay for prey, because they need a big MDM solution, or they don't want to use big tech's spyware like Apple or Google's location feature. Offering this in the F-Droid repo would definitely plant Prey Project as an advocate of privacy, security, and FOSS. I'm on the cusp of paying for it for my family to use, but with this not being in F-Droid and no APK to install leaves a bad taste in my mouth.