quick docker contained app

basic

# echo '{"test":123, "peso": [1,2,3]}' | docker run -i --rm --networking=false app /bin/bash -c 'cat - | php app.php'
object(stdClass)#1 (2) {
  ["test"]=>
  int(123)
  ["peso"]=>
  array(3) {
    [0]=>
    int(1)
    [1]=>
    int(2)
    [2]=>
    int(3)
  }
}