Download the APK for obtainium and then you can add GitHub sources for apks like amethyst, and obtainium will notify when there's an update and you can update through obtainium and it pull directly from source git.

Here's a cpu Info app if you need to check your architecture

github.com/kamgurgul/cpu-info

And here's amethyst so you don't have to go looking

github.com/vitorpamplona/amethyst

Honorable mentions:

Robosats: github.com/RoboSats/robosats

Zeus: github.com/ZeusLN/zeus

🤙