DOC: add a hint how to provide a readable certificate

Summary

please just look at the change

Note: #1 (closed)

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• All automated tests pass
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compose/docker-compose.yml

@@ -51,6 +51,8 @@ services:
 
   envoy:
     image: envoyproxy/envoy:v1.21-latest
+    # environment:
+    #   ENVOY_UID: 987
     volumes:
       - type: bind
         read_only: true