Fix yarn workspace

Tracking issue for https://github.com/prisma/prisma/issues/5266#issuecomment-767656190

Clone blitz-js/blitz
```
yarn
yarn build
cd examples/auth
blitz start
# Open page in browser
# See Error: @prisma/client did not initialize yet. Please run "prisma generate" and try to import it again.
```