add changelog entry

changelog/5404.doc.rst

@@ -0,0 +1,5 @@
+Explain how to run commands as ``root`` user in Rasa SDK Docker images since version
+``1.8.0``. Since version ``1.8.0`` the Rasa SDK Docker images does not longer run as
+``root`` user by default. For commands which require ``root`` user usage, you have to
+switch back to the ``root`` user in your Docker image as described in
+:ref:`deploying-your-rasa-assistant_custom-dependencies`.

docs/user-guide/how-to-deploy.rst

@@ -382,6 +382,8 @@ Add this to your ``endpoints.yml`` (if it does not exist, create it):
 Run ``docker-compose up`` to start the action server together
 with Rasa.
 
+.. _deploying-your-rasa-assistant_custom-dependencies:
+
 Adding Custom Dependencies
 **************************