fix: add MLFLOW_FLASK_SERVER_SECRET_KEY to CI test values

MLflow 3.x requires MLFLOW_FLASK_SERVER_SECRET_KEY environment variable.
The CI test values file was missing this configuration, causing the
server to fail to start during CI tests even though it worked locally
with default values.

Author: chris-sanders

applications/mlflow/tests/helm/nodeport-ingress-disabled.yaml

@@ -2,16 +2,20 @@
 # These values specifically configure the service to use NodePort for testing
 
 mlflow:
-  ingress: 
+  ingress:
     enabled: false
   # Service configuration for MLflow
   service:
     # Use NodePort to expose the service on a specific port
     type: NodePort
     # Service port number (internal)
     port: 5000
-    # Hardcoded nodePort for consistent access 
+    # Hardcoded nodePort for consistent access
     # Note: Must be between 30000-32767
     nodePort: 30080
     # Service port name
     name: http
+  # Environment configuration
+  env:
+    configMap:
+      MLFLOW_FLASK_SERVER_SECRET_KEY: "change-me-in-production"