Copying all and only `.scad` files

[Irev-Dev]

I've was playing around a little found that the following command
rsync -a --prune-empty-dirs --include '*/' --include '*.scad' --exclude '*' ./ ./target
Works nicely for keeping the data structure of this repo but removing everything apart from .scad files
Goes from being about 300MB to 22MB, I could look into setting up a github action that does the same thing and puts them into a release, and that way the CadHub-OpenSCAD could download the latest release when it's building?

Stole it from: https://unix.stackexchange.com/questions/83593/copy-specific-file-type-keeping-the-folder-structure/83596#