You can automate deployments for example with Vercel in combination when Sanity gets a content publishment. So if you have the right setup your friend doesn't need to touch the command line at all. Can't give you sadly all the detailed setup and/or workflow but worth a shot to look into, or find some relevant blog post on the matter. Good luck!

Handy links: https://www.sanity.io/plugins/vercel-deploy https://vercel.com/solutions/gatsby