feat: containerize marketing_strategy example

[fiam]

Add a Dockerfile and docker-compose.yaml to run the marketing_strategy example in a Docker container using Docker Model Runner and Docker MCP gateway.

This enables running the demo without requiring any API keys.

Also updates the README with instructions for running the example inside Docker.

Signed-off-by: Alberto Garcia Hierro [email protected]

[github-actions[bot]]

This PR is stale because it has been open for 45 days with no activity.