Update 'Jenkinsfile'

fix sintax

Jenkinsfile

@@ -34,14 +34,14 @@ pipeline {
                 sh 'mvn --settings $MAVEN_CONFIG_FOLDER/$gcube_settings -Dmaven.repo.local=$MAVEN_CONFIG_FOLDER/$local_repo $build_options dependency:tree clean deploy'
             }
         }
-    }
-    stage('Clean') {
-      steps{
-        sh "mvn clean"
+    
+       stage('Clean') {
+         steps{
+           sh "mvn clean"
 
-      }
+         }
+       }
     }
-  }
           // post-build actions
     post {
         success {