Allow Dockerfiles to be executed with the help of PHP

Dockerfile

#!/usr/bin/php
#<?php echo "\010"; system("docker build --tag=meh .", $retval); if ($retval==0 && $argc == 2 && $argv[1] == "run") { system("docker run meh", $retval); } exit($retval); /*

# Pre-build: $ chmod +x ./Dockerfile

# To build:         $ ./Dockerfile
# To build and run: $ ./Dockerfile run

FROM node:6

CMD [ "echo", "hello world" ]
# */