Do we need a

~/.prisma/config.yml

file if we are deploying to the shared cluster? it's not clear to me in the docs https://www.prismagraphql.com/docs/reference/clusters/overview-eu2ood0she

If you are deploying while logged in, yes. If you deploy without logging in, no.

thanks TIm

Btw I just updated the docs, they now answer exactly the question you had