Update helm/templates/deployment.yaml

Co-authored-by: Pavel Busko <pavel.busko@sap.com>

Author: nicolasbender

helm/templates/deployment.yaml

@@ -45,4 +45,4 @@ spec:
       volumes:
         - name: policy-agent
           secret:
-            secretName: {{ default "policy-agent" .Values.certificateSecret }}
+            secretName: {{ required "certificateSecret is a required value" .Values.certificateSecret }}