public void ensureMachineRunning(@NonNull String machineName) {
        if (!isMachineRunning(machineName)) {
            LOGGER.info("Docker-machine '{}' is not running. Will start it now", machineName);
            CommandLine.runShellCommand("docker-machine", "start", machineName);
        }
    }
Obtain an instance of the DockerMachineClient wrapper.

@return the singleton instance of DockerMachineClient
core/src/main/java/org/testcontainers/utility/DockerMachineClient.java