Nokia's power management app kills Briar
Nokia phones running Android 8+ have a power management app with the package name com.evenwell.powersaving.g3 or com.evenwell.emm that kills all background apps 20 minutes after the screen turns off, prevents alarms from firing, and prevents background apps from starting foreground services. Doze whitelisting doesn't help.
https://dontkillmyapp.com/nokia
The only known workaround for users without ADB is to force close the power saving app. Presumably this needs to be done after every boot.
We can detect whether the device is affected by this issue by looking at the list of installed packages (and maybe the manufacturer and Android version), but we can't prevent the issue from happening. Perhaps we should show a warning that Briar won't work properly on this device?
Related to #992.