Build CoreELEC in a docker container

Pull the image and run the container

• docker pull coreelec/coreelec-builder:latest
• docker run -v ~/:/home/docker -h coreelec -it coreelec-builder

Clone repo and build image inside container

• git clone git://github.com/CoreELEC/CoreELEC.git ~/CoreELEC
• cd ~/CoreELEC
• time(PROJECT=Amlogic-ng ARCH=arm make image)
  Use PROJECT=Amlogic to build images for older S912 and S905/X/D devices