The PaaS is really modular, that's why it contains the strict necessary, then you'll probably want to add `system` modules or `applications`.
It contains 2 [unit-files](https://github.com/indiehosters/LibrePaaS/tree/master/unit-files) to manage system modules and applications, start them at boot, and load the appropriate environment.
It contains 2 [unit-files](https://lab.libreho.st/libre.sh/compose.libre.sh/tree/master/unit-files) to manage system modules and applications, start them at boot, and load the appropriate environment.