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+ pipeline {
+    agent none
+    stages {
+            stage('Back-end build') {
+            agent {
+                docker { 
+                    image 'maven'
+                    label 'master'  
+                    args '-u root'
+                 }
+            }
+            steps {
+                sh 'mvn clean package'
+                stash includes: 'target/*.war', name: 'pet' 
+                }
+            }
+        }
+    }