Update Jenkinsfile

Jenkinsfile

-node {
-    stage('Clone sources') {
-        git branch: 'DRIP_3.0', url: 'https://github.com/skoulouzis/DRIP.git'
-    }
-    stage('Build') {
-            echo 'Building'
-            git branch: 'DRIP_3.0', url: 'https://github.com/skoulouzis/DRIP.git'
-            sh "mvn -Dmaven.test.skip=true install"    
-            sh "cd drip-planner && python3 -m venv venv && venv/bin/pip3 install -r requirements.txt"   
-            sh "cd ../"
-            sh "cd sure_tosca-flask-server && python3 -m venv venv && venv/bin/pip3 install -r requirements.txt && venv/bin/pip3 install -r test-requirements.txt"
-    }
-    stage('Test') {
-        echo 'Testing'
-        sh "mvn test"
-        sh "cd drip-planner && venv/bin/python3 -m unittest discover"   
-        sh "cd sure_tosca-flask-server && venv/bin/python3 -m unittest discover"   
-    }
-    stage('Package') {
-        echo 'Deploying'
-        sh "cd drip-manager && mvn -Dmaven.test.skip=true install dockerfile:build"
-    }
+pipeline {
+   agent any
+   tools {
+      // Install the Maven version configured as "M3" and add it to the path.
+      maven "maven-3.6.2"
+      jdk "openjdk-11"
+   }
+
+   stages {
+      stage('Build') {
+            steps {
+                echo 'Building'
+                git branch: 'DRIP_3.0', url: 'https://github.com/skoulouzis/DRIP.git'
+                sh "mvn -Dmaven.test.skip=true install"    
+                sh "cd drip-planner && python3 -m venv venv && venv/bin/pip3 install -r requirements.txt"   
+                sh "cd ../"
+                sh "cd sure_tosca-flask-server && python3 -m venv venv && venv/bin/pip3 install -r requirements.txt && venv/bin/pip3 install -r test-requirements.txt"   
+                sh "pwd && ls"
+        }
+      }
+      stage('Test') {
+          steps {
+              echo 'Testing'
+              sh "mvn test"
+              sh "cd drip-planner && venv/bin/python3 -m unittest discover"   
+              sh "cd sure_tosca-flask-server && venv/bin/python3 -m unittest discover"   
+          }
+        }
+        stage('Package') {
+            steps {
+                echo 'Deploying'
+                sh "cd drip-manager && mvn -Dmaven.test.skip=true install dockerfile:build"
+                
+            }
+        }             
+        stage('Deploy') {
+            steps {
+                echo 'Deploying'
+                
+            }
+        }        
+   }
 }