Fix: Tunnel --PORT parameter not working in Node.js app.

[paul-phan]

WHY are these changes introduced?

After version 2.7.0, we no longer can use a custom port for ngrok tunnel. Seem like there was a missing parameter in the node_service.rb

WHAT is this pull request doing?

Add the port parameter to the tunnel start function.

How to test your changes?

For Node.js project, assume you want to tunnel the localhost:3000.
This command should work: shopify app serve --PORT 3000

Post-release steps

Update checklist

• I've added a CHANGELOG entry for this PR (if the change is public-facing)
• I've considered possible cross-platform impacts (Mac, Linux, Windows).
• I've left the version number as is (we'll handle incrementing this when releasing).
• I've included any post-release steps in the section above.

[gonzaloriestra]

Thanks for your contribution, @paul-phan! 👏

Your changes look right. However, we would need a few things:

• Could you sign the Contributor License Agreement (CLA)?
• Add this change to the CHANGELOG.md (Unreleased section)
• Would you mind adding tests for this? I think it would be enough if you add something like ShopifyCLI::Tunnel.expects(:start).with(@context, port: 5000).returns("https://example.com") to the tests named test_call_when_port_passed and test_server_command_when_port_passed

[gonzaloriestra]

Thanks for the changes! I've already tested it and it works as expected 👌

There are just a few minor details to be fixed and we can merge it!

[paul-phan]

Thanks for your suggestion; I've updated it!

[gonzaloriestra]

Ready to merge 🚀

It will be included in the next release. Thanks!