Use vcgencmd within a docker node-red container

[mikeS7]

Checked right now, confirmed it doesn't work. It was in time when Node-RED image was based on debian linux. I solved it by using custom image with following in Dockerfile:

USER    root
RUN     apk add --no-cache raspberrypi
USER    node-red

You don't need to use volume mapping in such case.

PS Later I will create PR or open an issue.