Configuration .env file read path not found in document

[Guxingzhe]

• Read the docs.
• Use Vite >=2.0. (1.x is no longer supported)
• If the issue is related to 1.x -> 2.0 upgrade, read the Migration Guide first.

Describe the bug

The . env files can only be read in the root directory. I hope it can be configured to read in the config folder.For different environments, I will configure many different .env files. In this way, there will be a lot of files in the root directory, which is very messy.

Reproduction

System Info

• vite version:1.0.0-rc.13
• Operating System:windows7
• Node version:v13.14.0
• Package manager (npm/yarn/pnpm) and version: npm 6.14.4

Logs (Optional if provided reproduction)

[github-actions]

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