Update README: Instructions to Run with Docker alongside other services.

Update the README to provide clear instructions for running this service with Docker in conjunction with the full operations stack. The steps should be:

1. Follow the steps described in the operations/docker directory to launch all services in the operations stack with Docker Compose.
2. Once all services are up, stop the container (or service) corresponding to runner_controller_microservice.
3. Use the Docker Compose file provided in this repository (runner_controller_microservice) to launch an updated version of this microservice, making sure to set any required environment variables so it can communicate properly with the other stack services.
4. Ensure the new instance integrates seamlessly with the rest of the running stack.
5. Document any additional or changed environment variables, networking considerations, or ports needed for integration.

This update will help users cleanly upgrade or develop on top of runner_controller_microservice without redeploying the full stack.