Step 4: Possible Default
When I got to the 4th question, build/sw.js was the default response. In this scenario, just press ENTER.
Step 6: Search Parameters
My final question was Does your web app manifest include search parameter(s) in the 'start_url', other than 'utm_' or 'fbclid' (like '?source=pwa')?
Not knowing how to answer, I just chose the default value No.
Note: When installing the npm dependencies after cloning your repo, I used npm ci. I'm not sure if that altered the trajectory of the steps I'd need to follow. If so, my apologies for wasting your time.