I want to compile all the GUI LineageOS apps and release their APKs.
To make them installable on other Android OS, I need to change the app ID. Otherwise Android would attempt an upgrade and fail because of mismatching keys.
I'm not seeing any build.gradle files so you wouldn't need to change namespace in those.
It looks like there's a build config file you might need to change but I'm unsure.
Ultimately you can pop open android studio and hit Ctrl+shift+R and replace all com.android.deskclock with org.lineageos.deskclock - that might be easiest. I'd do a Ctrl+shift+F for org.lineageos.deskclock first to be sure I don't have any clashing namespace but I think you're good.