$ curl https://raw.githubusercontent.com/khasbilegt/passcast/main/install.sh -sSf | shOr you can manually download passcast.py and put it into your desired directory.
To add your script to Raycast open Raycast Preferrences, goto Extensions, click Add (+) or (CMD + N), click Add Script Directory, choose your directory (if you've installed with script ~/.config/raycast/scripts)