update Jenkinsfile

Jenkinsfile

@@ -1,15 +1,17 @@
 pipeline {
-    agent {
+  agent {
-        docker {
+    docker {
-            image 'node:6-alpine'
+      image 'node:6-alpine'
-            args '-p 3000:3000'
+      args '-p 3000:3000'
-        }
     }
-    stages {
+
-        stage('Build') {
+  }
-            steps {
+  stages {
-                sh 'cd frontend; npm install; npm run build'
+    stage('Build') {
-            }
+      steps {
-        }
+        sh 'npm install'
+      }
     }
-}
+
+  }
+}