Helm template ragflow.yaml: fix nginx-config-volume mountPath according to Dockerfile v0.25.0 (#14361)

### What problem does this PR solve?

Dockerfile v0.25.0 expects nginx conf at path
/etc/nginx/ragflow.conf.python, see
[Dockerfile#L200](ca01c7a745/Dockerfile (L200))
However current helm template mount the conf at path
/etc/nginx/ragflow.conf causing runtime error at startup time.

### Type of change

- [X] Bug Fix (non-breaking change which fixes an issue)

---------

Co-authored-by: Mauro Gattari <mauro.gattari@infn.it>

helm/templates/ragflow.yaml

@@ -55,8 +55,8 @@ spec:
             name: admin
           {{- end }}
         volumeMounts:
-          - mountPath: /etc/nginx/conf.d/ragflow.conf
-            subPath: ragflow.conf
+          - mountPath: /etc/nginx/conf.d/ragflow.conf.python
+            subPath: ragflow.conf.python
             name: nginx-config-volume
           - mountPath: /etc/nginx/proxy.conf
             subPath: proxy.conf

helm/templates/ragflow_config.yaml

@@ -18,7 +18,7 @@ kind: ConfigMap
 metadata:
   name: nginx-config
 data:
-  ragflow.conf: |
+  ragflow.conf.python: |
     server {
         listen 80;
         server_name _;