[Apple Silicon installation]: Add this to the installation guide

[CHJ85]

Is there an existing issue for this?

• [X] I have searched the existing issues and checked the recent builds/commits

What would your feature do ?

Hi there. Apple does not run CUDA, so the export torch cuda test is obviously not needed.

Proposed workflow

You might wanna tell people to run export COMMANDLINE_ARGS="--skip-torch-cuda-test" prior to running the webui.sh script.

Additional information

No response