allow configurable Next.js dev origins

[hjlarry]

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1. Is this request related to a challenge you're experiencing? Tell me about your story.

Allow configuring Next.js development allowed origins through an environment variable.

This is useful for remote development scenarios where the dev server is accessed through a LAN, VPN, or IP instead of localhost.

2. Additional context or comments

No response

3. Can you help us with this feature?

• I am interested in contributing to this feature.