#177 docker support

[Patrick Wasp]

Hi,
I'm running in a python 3 script inside Docker ubuntu image on a Raspberri Pi 4 with ubuntu 18.04 installed, and I get the following error when trying use the library.

>>> from RPi import GPIO
>>> GPIO.setup(12, GPIO.OUT)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
RuntimeError: Mmap of GPIO registers failed

[Patrick Wasp]

needed to add the /dev/gpiomem device
docker container run --device /dev/gpiomem -d ubuntu

https://iotbytes.wordpress.com/create-your-first-docker-container-for-raspberry-pi-to-blink-an-led/

not sure how to close a ticket on this platform