Orange Pi Zero H2 GPIO Power Button?

AeitZean

Hi, I've been looking around for a way to cleanly shutdown my Orange Pi Zero without having to connect to it every time. I'm sure someone must have pre made a script that maps a GPIO input (like a button) to the shutdown command, can anyone point me in the right direction? currently I'm running Armbian stretch 4.14.y from https://www.armbian.com/orange-pi-zero/ on an Orange Pi Zero H2 512MB if any of that helps.

thanks