protected void waitUntilContainerStarted() {
        WaitStrategy waitStrategy = getWaitStrategy();
        if (waitStrategy != null) {
            waitStrategy.waitUntilReady(this);
        }
    }
Wait until the container has started. The default implementation simply
waits for a port to start listening; other implementations are available
as implementations of {@link WaitStrategy}

@see #waitingFor(WaitStrategy)
core/src/main/java/org/testcontainers/containers/GenericContainer.java