How to integrate Drush into PuPHPet

Yeah. Long time without writing here. I have lost about 2 or 3 hours of my life trying to configure it. So I think it deserves a post so anyone googling can find it.
It is as simple as adding the following to your config.yaml file:

drush:
    install: '1'
    version: '8.x'

Yes. That's right. PuPHPet supports Drush already (I think because Puppet does.) Make sure you are already using php with composer, otherwise it won't work.