Run a disposable local container

Steps

1. Pull a fully qualified NGINX image and record its digest.
2. Run one temporary container named curriculum-nginx-test, bound to 127.0.0.1 only.
3. Open the local address and check the response.
4. Stop and remove curriculum-nginx-test.

Verify and rollback

The service responds locally and no container or published port remains. Never bind a demonstration to every interface.