fix: don't enable admin server /config by default

This now requires setting `admin-server-config-enabled`.

docs/references/admin_server.rst

@@ -55,10 +55,12 @@ Metrics
 
 Provides :ref:`metrics`.
 
+.. _runtime_config:
+
 Runtime Configuration
 =====================
 
-Provides a ``config`` endpoint that returns the runtime :ref:`configuration`.
+Provides a ``config`` endpoint that returns the runtime :ref:`configuration`. This requires setting :ref:`admin-server-config-enabled`.
 
 .. code-block:: bash
 
@@ -72,6 +74,8 @@ Provides a ``config`` endpoint that returns the runtime :ref:`configuration`.
   db-channel-enabled = false
   ...
 
+.. _runtime_schema_cache:
+
 Runtime Schema Cache
 ====================
 

docs/references/configuration.rst

@@ -161,6 +161,30 @@ admin-server-port
 
   Specifies the port for the :ref:`admin_server`.
 
+.. _admin-server-config-enabled:
+
+admin-server-config-enabled
+---------------------------
+
+  .. danger::
+
+    The ``/config`` endpoint contains sensitive information, don't enable this if you're exposing the Admin Server publicly.
+
+    To safely enable this you can use a proxy like :ref:`nginx` to:
+
+    - Ensure ``/config`` are only available to local networks.
+    - Only expose ``/live`` and ``/ready`` to public networks.
+
+  =============== =================================
+  **Type**        Boolean
+  **Default**     False
+  **Reloadable**  N
+  **Environment** PGRST_ADMIN_SERVER_CONFIG_ENABLED
+  **In-Database** `n/a`
+  =============== =================================
+
+  Enables the admin server :ref:`runtime_config` and :ref:`runtime_schema_cache` endpoints.
+
 .. _app.settings.*:
 
 app.settings.*