Few years ago I did the same thing with a raspberry pi zero W and two bash scripts - one for power on/off one for reset. It's quite useful to have and was born out of the need to reboot my Ryzen 1700x powered pc, due to p(ower)state bug that I only uncovered as the culprit a year ago.

Here's a simple writeup with pictures : https://1drv.ms/u/s!Au9Lr9dxN7gUs8AQo6pkvUxXb1DD4g?e=DCqDzG