toolbox: Add initial toolbox support
Add a basic image for toolbox [1] containers.
This image uses the package-source-builder image as base and includes extra tools required by toolbox.
https://phabricator.collabora.com/T31518
Signed-off-by: Andre Moreira Magalhaes andre.magalhaes@collabora.com
Edited by Andre Moreira Magalhaes