private StartupStatus checkState(InspectContainerResponse.ContainerState state) {
        if (Boolean.TRUE.equals(state.getRunning())) {
            return StartupStatus.SUCCESSFUL;
        } else if (DockerStatus.isContainerStopped(state)) {
            if (DockerStatus.isContainerExitCodeSuccess(state)) {
                return StartupStatus.SUCCESSFUL;
            } else {
                return StartupStatus.FAILED;
            }
        } else {
            return StartupStatus.NOT_YET_KNOWN;
        }
    }
Simplest possible implementation of {@link StartupCheckStrategy} - just check that the container
has reached the running state and has not exited.
core/src/main/java/org/testcontainers/containers/startupcheck/IsRunningStartupCheckStrategy.java