DietPi is a lightweight Debian based Linux distribution for SBCs, server systems but also with optional support for easily install desktop environments. It ships as minimal image but allows to easily install complete and ready-to-use server stacks with a set of console/whiptail based shell dialogs and scripts.
Read all info at:
https://dietpi.com/
The source code is hosted at GitHub:
https://github.com/MichaIng/DietPi