This repo contain definition files to build a Vagrant box based on the weekly Debian Jessie (Testing) iso images.
You need to install Vagrant and veewee with your favorite package manager to build the image.
Just run the following command in the repository root:
$ veewee vbox build Debian-jessie-amd64-netboot
$ veewee vbox export Debian-jessie-amd64-netboot
You need to choose hdd when asked to install grub.