Push button to open/stop garage door with Hasbian

Hello,

I’m new to Home Assistant. I would like to build a setup where I can control a garage door. I want to use a relay to close the circuit to give a signal to the garage door.
I would like to have a push button (doorbel button) in the software to control the relay. So when I push the button, the relay is closed and when I release the button, the relay turns open again.

I have HA on a raspberry Pi and I control the relay over the GPIO pins.

I hope you can help me!