should listen for config file changes when specifying the app directory

[await-ovo]

Verify canary release

• I verified that the issue exists in Next.js canary release

Provide environment information

    Operating System:
      Platform: darwin
      Arch: x64
      Version: Darwin Kernel Version 20.6.0: Wed Jan 12 22:22:42 PST 2022; root:xnu-7195.141.19~2/RELEASE_X86_64
    Binaries:
      Node: 14.19.0
      npm: 6.14.16
      Yarn: 1.22.17
      pnpm: 6.32.3
    Relevant packages:
      next: 12.1.6-canary.14
      react: 18.1.0
      react-dom: 18.1.0

What browser are you using? (if relevant)

No response

How are you deploying your application? (if relevant)

No response

Describe the Bug

When you run next dev in the project root directory and modify next.config.js, you will soon see a prompt in the terminal that you need to restart the server.

However, if you start the project with next dev some-dir, you will not see any hints after modifying the next.config.js

Expected Behavior

Should also listen to next.config.js changes when run next dev some-dir

To Reproduce

1. npx create-next-app@latest test-watch-config
2. ./test-watch-config/node_modules/.bin/next dev ./test-watch-config
3. modify ./test-watch-config/next.config.js

Should see a prompt in the terminal that you need to restart the server.

[github-actions]

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