fix: need to mount config file in docker run

Author: mabuyo

docs/source/deploy.mdx

@@ -28,6 +28,7 @@ docker run \
   --env APOLLO_GRAPH_REF="<your-graph-ref>" \
   --env APOLLO_KEY="<your-graph-api-key>" \
   --env MCP_ENABLE=1 \
+  -m /path/to/config:/config/mcp_config.yaml \
   --rm \
   ghcr.io/apollographql/apollo-runtime:latest
 ```
@@ -36,12 +37,11 @@ When you run this, it will:
 
 - Fetch your schema from GraphOS using your graph credentials (`APOLLO_GRAPH_REF` and `APOLLO_KEY`)
 - Start the Apollo Router with your graph configuration
+- Provides a configuration file for the MCP server by mounting it to `config/mcp_config.yaml`
 - Enable the Apollo MCP Server endpoint at `/mcp`
 
 This command uses GraphOS-managed persisted queries for MCP tools. You'll need to publish your operations to the [GraphOS-managed persisted queries list](/apollo-mcp-server/define-tools#from-graphos-managed-persisted-queries). If you want to use other methods for defining MCP tools, see the [Define MCP Tools](/apollo-mcp-server/define-tools) page.
 
-You can provide a configuration file for the MCP server in `config/mcp_config.yaml`. The container will automatically use this file if it exists.
-
 To learn more, see the [Apollo Runtime Container documentation](/graphos/routing/self-hosted/containerization/docker).
 
 ## Standalone Apollo MCP Server container