*** tests apt installation of a metapackage in a specific distro.
* 'edu-packages_$(distro)_$(src-package)':
** builds one of the six debian-edu packages ('debian-edu', 'debian-edu-config', 'debian-edu-install', 'debian-edu-doc', 'debian-edu-artwork', 'debian-edu-archive-keyring' on every push to it's git master branch
** and whenever 'debian-edu-doc' is build, https://jenkins.debian.net/userContent/debian-edu-doc/ get's updated automatically afterwards too.
** and whenever 'debian-edu-doc' is build, https://jenkins.debian.net/userContent/debian-edu-doc/ gets updated automatically afterwards too.