Fix integration test timeouts in CI

[Copilot]

Integration tests were timing out in CI due to unbounded Docker image pulls during test execution. The eclipse-mosquitto:latest image pull could hang indefinitely without timeout handling.

Changes

CI workflow

• Pre-pull eclipse-mosquitto:latest with 300s timeout before test execution

Test fixtures

• Add pull_docker_image_with_timeout() helper with configurable timeout (default: 300s)
• Check image availability before container creation; pull with timeout if missing
• Improve error messages for Docker daemon and network failures

Makefile

• Remove CI skip condition for integration tests

Implementation

def pull_docker_image_with_timeout(
    docker_client: docker.DockerClient, image: str, timeout: int = DOCKER_PULL_TIMEOUT
) -> None:
    """Pull a Docker image with a timeout."""
    import concurrent.futures

    def _pull_image() -> None:
        try:
            docker_client.images.pull(image)
        except docker.errors.APIError as e:
            raise RuntimeError(f"Failed to pull Docker image {image}. Error: {e}") from e

    with concurrent.futures.ThreadPoolExecutor(max_workers=1) as executor:
        future = executor.submit(_pull_image)
        try:
            future.result(timeout=timeout)
        except concurrent.futures.TimeoutError as e:
            raise TimeoutError(f"Timeout pulling {image} after {timeout}s") from e

The fixture now checks for image availability and pulls with timeout only if needed, preventing the implicit unbounded pull during containers.run().

Original prompt

---

This section details on the original issue you should resolve

<issue_title>CI: Integration Tests Fail With Timeout</issue_title>
<issue_description>Here's an example. Looks like pulling the image from the Docker Hub hangs. Need to figure out why.</issue_description>

Comments on the Issue (you are @copilot in this section)

@rnovatorov @copilot, maybe you know what's the problem here?

• Fixes CI: Integration Tests Fail With Timeout #33

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