Fix file param

Jenkinsfile-predict-s444356

@@ -5,7 +5,10 @@ pipeline {
         }
     }
     parameters {
-        file 'input_example.json'
+        file(
+            name: 'input_example.json',
+            description: 'Example input file for the model'
+        )
         buildSelector(
 			defaultSelector: lastSuccessful(),
 			description: 'Which build to use for copying artifacts',
@@ -21,6 +24,7 @@ pipeline {
         }
         stage('Predict values using model from artifact') {
             steps {
+                sh "cat input_example.json"
                 sh "python predict_s444356.py"
             }
         }