Feature Request: Support `./dr.sh vendor/bin/phpunit` or similar

[silbinarywolf]

Why?
Simpler mapping to how you might execute phpunit, phpstan, etc.
I keep having to jump back into the docs and remembering the ./dr.sh php exec command.

When we developers use thirdparty tools like vendor/bin things, they should be able to follow the documentation and just prefix ./dr.sh

How?

• If $cmd contains at start of first argument "vendor/bin/"
• If "vendor/bin" folder exists, proceed to next step, if not show message:
  • "Error, unable to find vendor/bin folder. Have you run composer install? Is this a PHP project?"
• Drop into phpcli and execute that command.

[silbinarywolf]

@nyeholt If you have no problem with this going in, I'm happy to PR it.

[silbinarywolf]

Gave it a bit more thought, this might be over-reaching a bit.

Maybe something to detect this case, and then it teaches the dev how to shell into their container and execute that command.

That way the person gets more of an understanding of how Docker stuff works.

[nglasl]

@nyeholt could you please provide some input here?