Use Java system properties to retrieve baseUrl value in src/test/java/karate-config.js

[riyadshauk]

It would be nice if you would show an example of using Java system properties (maybe from application.properties or application-test.properties?) to retrieve the value of baseUrl in src/test/java/karate-config.js, so that it could possibly be retrieved based on set environment variables during a CI/CD pipeline stage when running tests.

I saw https://github.com/intuit/karate#dynamic-port-numbers but it wasn't immediately obvious why that didn't work on a first attempt for me.