Managing config, path to automation for MME

In telecoms/networking, any recommendations to manage config for E.g. MME nodes? Currently it's done with big spreadsheets for all config, plus imsi etc Ideally we want a central source of truth, easily accessed and updated by authorised people only, version controlled. Initially for recording configuration, but ideally with path to introducing automatic configuration E.g. via netconf. And ideally not vendor specific e.g enm

Having a look at Tailf/Cisco ConfD (what a mission to create account to just download the thing, and no official docker container boooo) but it's nontrivial to setup.