updates documentation with info about new env var and dedicated user gotenberg

build/docs/content/01-install.md

@@ -10,6 +10,8 @@ You may start it with:
 $ docker run --rm -p 3000:3000 thecodingmachine/gotenberg:5
 ```
 
+All processes in the docker container runs as a dedicated non-root user called `gotenberg` with user id `1001` from the working dir `/gotenberg`.
+
 > The API will be available at [http://localhost:3000](http://localhost:3000).
 
 ## Docker Compose
@@ -38,5 +40,12 @@ Otherwise the API will not be able to launch Google Chrome and LibreOffice (unoc
 
 > The more resources are granted, the quicker will be the conversions.
 
+Also, in the deployment spec of the pod, specify the uid `1001` of the user `gotenberg`: 
+```
+        securityContext:
+          privileged: false
+          runAsUser: 1001
+```
+
 In the following examples, we will assume your
 Gotenberg API is available at [http://localhost:3000](http://localhost:3000).