docs: Add comments on ui extraenvs

Author: David Sabatie

charts/postgres-operator-ui/values.yaml

@@ -48,6 +48,11 @@ envs:
   teams:
     - "acid"
 
+# configure extra UI ENVs
+# Extra ENVs are writen in kubenertes format and added "as is" to the pod's env variables
+# https://kubernetes.io/docs/tasks/inject-data-application/define-environment-variable-container/
+# https://kubernetes.io/docs/reference/kubernetes-api/workload-resources/pod-v1/#environment-variables
+# UI specific env variables can be found here: https://github.com/zalando/postgres-operator/blob/master/ui/operator_ui/main.py
 extraEnvs:
   []
   # Exemple of settings to make snapshot view working in the ui when using AWS