helm/add iceberg rest catalog ingress for s3 (#8205)

* helm: add Iceberg REST catalog support to S3 service

* helm: add Iceberg REST catalog support to S3 service

* add ingress for iceberg catalog endpoint

* helm: conditionally render ingressClassName in s3-iceberg-ingress.yaml

* helm: refactor s3-iceberg-ingress.yaml to use named template for paths

* helm: remove unused $serviceName variable in s3-iceberg-ingress.yaml

---------

Co-authored-by: yalin.sahin <yalin.sahin@tradition.ch>
Co-authored-by: Chris Lu <chris.lu@gmail.com>

k8s/charts/seaweedfs/values.yaml

@@ -1053,6 +1053,15 @@ s3:
     annotations: {}
     tls: []
 
+  icebergIngress:
+    enabled: false
+    className: ""
+    host: "seaweedfs-iceberg.cluster.local"
+    path: "/"
+    pathType: Prefix
+    annotations: {}
+    tls: []
+
 sftp:
   enabled: false
   imageOverride: null