Update iceberg support

manifests/helm/flink-sql-gateway/templates/flink-sql-gateway.yaml

@@ -77,12 +77,19 @@ spec:
               
               echo "Flink cluster is ready. Starting SQL Gateway..."
               
-              # Create flink-conf.yaml with remote cluster configuration
+              # Create flink configuration with environment variable substitution
               cat > /opt/flink/conf/config.yaml << EOF
               # Remote Flink Cluster Configuration
+              rest.bind-address: 0.0.0.0
               rest.address: {{ .Values.sessionCluster.name }}-rest
               rest.port: 8081
-              execution.target: remote
+              jobmanager.rpc.address: {{ .Values.sessionCluster.name }}
+              jobmanager.rpc.port: 6123
+              
+              # Session Cluster at Kubernetes
+              execution.target: kubernetes-session
+              kubernetes.namespace: {{ .Release.Namespace }}
+              kubernetes.cluster-id: {{ .Values.sessionCluster.name }}
               
               # SQL Gateway Configuration
               sql-gateway.endpoint.rest.address: 0.0.0.0
@@ -91,6 +98,13 @@ spec:
               # Table/SQL Configuration
               table.exec.source.idle-timeout: 30s
               table.exec.resource.default-parallelism: 1
+              
+              # Additional Flink Configuration from values
+              {{- with .Values.sqlGateway.flinkConfiguration }}
+              {{- range $key, $value := . }}
+              {{ $key }}: {{ $value }}
+              {{- end }}
+              {{- end }}
               EOF
               
               # Start SQL Gateway