[FEATURE] Gateway: Allow public IP for Gateway

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

The /login command only works if the domain of the gateway resolves to a private IP.

A bunch of companies don't run a VPN out of various reasons and therefore can't use the gateway at all.

I see that its maybe a good default, but there should be an option to run it how it suits my organizational needs.

Proposed Solution

Add an option to also allow public IPs for gateway authentication.

eg allowPublicGateway: true|false with defaulting to false.

Alternative Solutions

_No response_

Priority

High - Significant impact on productivity

Feature Category

Configuration and settings

Use Case Example

We want to grant internal developers and also contractors managed access via our gateway to control cost.

We don't run any VPN but act on a zero-trust network, where everything is based on SSO identity.

Additional Context

_No response_