[REQ] Feature Request Description

Is your feature request related to a problem? Please describe.

When generating the server stub code, I'd like the port to follow the port described on my yaml file.

My servers declaration is as follow:

servers:
  - url: http://{sub}localhost:8081
    description: Localhost
    variables:
      sub:
        enum:
          - malbork.
          - viccinni.
        default: malbork.

I'm generating a node express server with

npx openapi-generator generate -i openapi.yaml -g nodejs-express-server -o ./fake-api-express

But the generated server runs on port 3000 by default.

Describe the solution you'd like

It'd be nice if it could detect my localhost:8081 setting and use 8081 by default as its port configuration.

Describe alternatives you've considered

For now, I guess I can generate the code onde and put the config.js at .openapi-generator-ignore

Additional context

Start with the nodejs-express-server generator and trace how the generated server selects its default port from the OpenAPI servers declaration. Done means the generated server uses the port from the URL, including the shown localhost:8081 case, while preserving existing behavior when no port is declared.