In Installation.scd, assign the path/to/your/audio/files/folder to the "path"-variable.
If done correctly, the installation can be run on a Raspberry Pi accessed through ssh by running
sclang Installation.scd
Since the idea is to run this script on a Raspberry Pi headless on startup, there is no reason to implement a setting of samples-path as CLI, it should be hardcoded.
If you still crave this option you can supply this as a third optional argument
sclang Installation.scd path/to/folder