Update helm chart yaml README to have plugins custom config

Author: rahulgurnani

config/charts/inferencepool/README.md

@@ -124,6 +124,7 @@ The following table list the configurable parameters of the chart.
 | `inferenceExtension.extraServicePorts`      | List of additional service ports to expose. Defaults to `[]`.                                                          |
 | `inferenceExtension.flags`                  | List of flags which are passed through to endpoint picker. Example flags, enable-pprof, grpc-port etc. Refer [runner.go](https://github.com/kubernetes-sigs/gateway-api-inference-extension/blob/main/cmd/epp/runner/runner.go) for complete list.                                                            |
 | `inferenceExtension.flags.has-enable-leader-election` | Enable leader election for high availability. When enabled, only one EPP pod (the leader) will be ready to serve traffic.       |
+| `inferenceExtension.pluginsConfigFile`    | Path to custom EPP plugin file      |
 | `provider.name`                             | Name of the Inference Gateway implementation being used. Possible values: `gke`. Defaults to `none`.                   |
 
 ## Notes

config/charts/inferencepool/templates/epp-config.yaml

@@ -20,4 +20,7 @@ data:
   {{- if (hasKey .Values.inferenceExtension "pluginsCustomConfig") }}
   {{- .Values.inferenceExtension.pluginsCustomConfig | toYaml | nindent 2 }}
   {{- end }}
+  {{- if (hasKey .Values.inferenceExtension "pluginsConfigFile")}}
+    {{- .Files.Get (printf "%s" .Values.inferenceExtension.pluginsConfigFile) | indent 4}}
+  {{- end}}