Build Keystone inside turborepo fails

`// create turborepo
npx create-turbo@latest my-monorepo
cd my-monorepo

// add keystone to turborepo
cd apps
npm init keystone-app my-keystone-app

cd my-keystone-app
npm run build`

As I expect it should build production-ready static pages. But I'm receiving error `NEXT_EXPORT_ERROR`

If I move keystone outside of turborepo and install dependencies once again - it works fine. But inside - it fails.

Environment:

"@keystone-6/auth": "^7.0.2",
"@keystone-6/core": "^5.7.2",
"@keystone-6/fields-document": "^8.0.2",
Node version 18.18.0

windows 11, macos, and vercel build - same errors.

Reproduce the failure with the listed create-turbo, npm init keystone-app, and npm run build commands using the reported dependency and Node versions. Compare the generated Keystone app inside and outside the turborepo, then use the NEXT_EXPORT_ERROR output to identify the build difference; done means the turborepo app completes a production build on the reported environments.

Written by the indexing model from the issue text.