Feature: Optional ngrok and have self host dns with one endpoint per runner/commit id

[rajuversespace]

We should add a GitHub Actions workflow with optional ngrok API key add self-host DNS with one endpoint per commit/runner-id.
This will allow user to manually approve without a new clone from HEAD branch and allow approver, keeping the commit stable while approving for TF Apply

✅ Acceptance Criteria

• Mode Selection: Users can toggle between ngrok (default) and self-hosted using the portal-host-mode input.
• Custom Network Binding: The action successfully binds the internal web server to a user-defined IP and port via the selfhosted-listen-address parameter.
• Public URL Injection: The interactive portal correctly generates and displays the URL using the provided selfhosted-public-url instead of a dynamic ngrok address.
• Endpoint Isolation: Support for runner-endpoint-key ensures that multiple concurrent runners can share the same public DNS/IP without URL collisions (e.g., https://dns.com/run-1 vs https://dns.com/run-2).
• Notification Accuracy: Slack and Discord notifications correctly broadcast the custom self-hosted URL to stakeholders.
• Backward Compatibility: If no self-hosted parameters are provided, the action continues to function with ngrok as the fallback, ensuring zero breaking changes for existing users.

🌟 Why This Matters

• Security & Compliance: Allows teams to run interactive inputs within private networks or behind internal load balancers, keeping traffic off third-party tunneling servers.
• Infrastructure Control: Gives team full control over the networking stack, including SSL termination and traffic logging at the reverse proxy level.
• Cost Efficiency: Removes the dependency on paid ngrok tiers for features like reserved domains or increased tunnel limits.

🙋 This workflow is already in-use internally. If you’d like, can open a PR.

Note

Interactive-inputs-self-host
Terraform example GitHub workflow

[ooaklee]

Hey @rajuversespace, this improvement sounds really good! I've also been working on a 'hosted' version, but your proposed feature will definitely add additional value.

Please open a PR.

[rajuversespace]

@ooaklee

Added test-case to new feature

let me know if there is any changes needed
Thank you

[ooaklee]

Thank you for adding the tests 🫶

We'll likely have to update the README as well. Ideally, it would be great to have some example screenshots and GIFs of the new features while we extend where we have to in the text.

But we can do the README last if anything, so it doesn't feel like a constant rewrite.