Another way to run docker in spc binary

[crazywhalecc]

Related PR: #197.

pros:

1. When docker has already built, we can always use the latest spc binary in docker.
2. We can always use the latest src directory in docker if we are using source mode.
3. Zero file modification.

cons:

1. If we call --docker --help in binary or phar mode, we will get non-color help message for symfony/console.
2. Additional command.