camunda-academy/c8-develop-workers-lab ? reverse-engineered prompt

Build me a starter app for the Camunda 8 worker exercises, something I can open and run in one of the language folders here.

I want it to connect to a Camunda 8.10 SaaS cluster using my API client credentials, read them from a local env file, and be ready to pick up job worker tasks from the orchestration API. Include the small simulated service functions for customer credit and card charging, and wire them in the way a training lab would expect.

Please keep it simple and runnable, with clear setup steps, sensible defaults, and obvious places where I can fill in my own worker logic for the exercises. If anything about the current API or SDK has changed, look up the latest docs online and use the current recommended approach.