feat: add build path

[kuai6]

Hello folks.
There is the simple PR to add custom build path.

[LinkinStars]

@kuai6 The function itself is fine. Can you explain the exact usage scenario?
The reason we use MkdirTemp is because it creates a random folder(answer_build4277335726) each time to prevent build exceptions when the same folder is used incorrectly during a build.

[kuai6]

@kuai6 The function itself is fine. Can you explain the exact usage scenario? The reason we use MkdirTemp is because it creates a random folder(answer_build4277335726) each time to prevent build exceptions when the same folder is used incorrectly during a build.

I want to build the app with plugins on my private env with private npm registry.

I thought this is good idea to make a way to replace some files (like .npmrc) to build the app into private env. But now i figure out it is better to build the app without answer build -with...
So this PR still not solve my issue.