turn on GPIO status 1 led on drivebrain rev 2 board when drivebrain software is running

[RCMast3r]

nix package libgpiod

https://search.nixos.org/packages?channel=24.11&show=libgpiod&from=0&size=50&sort=relevance&type=packages&query=libgpio

https://lloydrochester.com/post/hardware/libgpiod-intro-rpi/

turn gpio off on kill of drivebrain software and if the systemd service is dead / inactive

may need to have a small systemd service monitoring util that gets launched in a different systemd service that all its job is to do is to change the LED statuses:

sdbus-cpp_2