So far, you have to compile the binaries yourself. I think the simplest option for the future would be to provide a deb package that can be easily downloaded/installed with apt-get install from a repository.
You can compile it on debian using the following commands:
su -c 'apt install cmake libboost-program-options-dev'
git clone https://github.com/hannes427/sysadmin
cd sysadmin
cmake CMakeLists.txt -DCMAKE_INSTALL_PREFIX=/usr/local/freepbx
cmake --build .
su -c 'mkdir /usr/local/freepbx'
su -c 'cmake --install .'
su -c 'chmod u+s /usr/local/freepbx/bin/*'
su -c 'cp -rp php /usr/local/freepbx'