I created a Vagrant\Chef project for spooling-up a dev box with Grav, the Admin Plugin, and Xdebug. It's in a branch of my common box repo at https://github.com/ardkevin84/vagrant-lamp-dev/tree/box-grav.
It's pretty painless - esp. if you already use Vagrant for development - vagrant up sets up the dev box, pulls grav from github, installs composer dependencies, runs bin/grav install, and installs the admin plugin+dependencies.