copy artifact

Jenkinsfile.eval

@@ -3,12 +3,29 @@ pipeline {
         dockerfile true
     }
     stages {
+        stage('Copy prev build artifact') {
+            steps {
+                script {
+                    if (currentBuild.previousBuild) {
+                        try {
+                            copyArtifacts(projectName: currentBuild.projectName,
+                                          selector: specific("${currentBuild.previousBuild.number}"))
+                            def previousFile = readFile(file: "trainResults.csv")
+                            echo("The current build is ${currentBuild.number}")
+                            echo("The previous build artifact was: ${previousFile}")
+                        } catch(err) {
+                            // ignore error
+                        }
+                    }
+                }
+            }
+        }
         stage('Copy') {
             steps {
                 copyArtifacts projectName: 's444417-training/master'
-                sh "ls -la"
                 sh 'python3 ./src/evalScript.py'
                 archiveArtifacts 'trainResults.csv'
+                sh "ls -la"
             }
         }
     }