Docker: Fix threading

Make sure that the container state is synchronized
with the main thread.

Change-Id: I8b50a380779038b273a1eb6645aa08309e90bc56
Reviewed-by: hjk <hjk@qt.io>

src/plugins/docker/dockerdevice.cpp

@@ -888,6 +888,15 @@ expected_str<void> DockerDevicePrivate::startContainer()
 
 bool DockerDevicePrivate::updateContainerAccess()
 {
+    if (QThread::currentThread() != thread()) {
+        bool result = false;
+        QMetaObject::invokeMethod(this,
+                                  &DockerDevicePrivate::updateContainerAccess,
+                                  Qt::BlockingQueuedConnection,
+                                  &result);
+        return result;
+    }
+
     if (m_isShutdown)
         return false;