nvm Mirror and Authentication

Configure nvm to download Node.js binaries from custom mirrors in restricted network environments.

Workflow

1. Set the mirror URL via environment variable:

   # Use a custom mirror (e.g., Taobao mirror for China)
   export NVM_NODEJS_ORG_MIRROR=https://npmmirror.com/mirrors/node
   
   # Then install as normal
   nvm install 20