Add docs for auth token config

Author: marianore-muttdata

docs/pages/reference/configuration/environment-variables.mdx

@@ -748,6 +748,13 @@ The Startree/Pinot null value support. If `true`, enables null handling.
 | --------------- | ---------------------- | --------------------- |
 | `true`, `false` |	`false`                | `false`               |
 
+## `CUBEJS_DB_PINOT_AUTH_TOKEN`
+
+The authentication token for StarTree to be passed as HTTP headers.
+
+| Possible Values                     | Default in Development | Default in Production |
+| ----------------------------------- | ---------------------- | --------------------- |
+| A valid string containing the token |	N/A                    | N/A                   |
 
 ## `CUBEJS_DB_SSL`