Allow env variables that are used to detect deployment environment

[MickL]

Verify canary release

• I verified that the issue exists in the latest Turborepo canary release.

Which canary version will you have in your reproduction?

2.3.4

Description

At Nitro / Nuxt environment variables are used to automatically determine what deployment environment the build is in, and then using a specific build preset for that environment. This results in a zero configuration build: Deploying Nuxt or Nitro projects to whatever provider (Vercel, Cloudflare, Deno Deploy, etc. etc.) just works automatically.

Unfortunately this doesnt work anymore when Turborepo comes into play because Turborepo removes all env variables that are not set in the globalEnv array (if not using --env-mode=loose).

May it be possible that you dont remove all environment specific variables that are used to determine the build environment by default? You can find a full list of the variables Nitro / Nuxt is using here: https://github.com/unjs/std-env/blob/main/src/providers.ts#L59

Issue at Nitro: nitrojs/nitro#3051