Merge branch 'update-docker-documentation' into 'master'

Update docker README to deny windows support

See merge request gitlab-org/omnibus-gitlab!2465

doc/docker/README.md

@@ -25,6 +25,8 @@ Docker installation is required, see the [official installation docs](https://do
 **Note:** Using a native Docker install instead of Docker Toolbox is recommended in order to use the persisted volumes
+**Warning:** We do not officially support running on Docker for Windows. There are known issues with volume permissions, and potentially other unknown issues. If you are trying to run on Docker for Windows, please see our [getting help page](https://about.gitlab.com/getting-help/) for links to community resources (IRC, forum, etc) to seek help from other users.
+
 ## Run the image
 Run the image: