Configurable NEXT_PUBLIC_ prefix

[igo]

Goals

Make prefix NEXT_PUBLIC_ configurable

Non-Goals

No response

Background

Making software that is built on top of Next.js requires configuring variables prefixed with NEXT_PUBLIC_. This is confusing for end user who are not familiar with Next.js. People are wondering that is "NEXT". It also expose implementation details which is not a good practice

Proposal

Make prefix configurable so I can rename it to for example MYAPP_PUBLIC_

[serdar-webdev]

Good idea, well done!

[Netail]

Made a draft PR for this idea: #67791 :)