add build and deploy steps

Jenkinsfile

@@ -2,10 +2,16 @@ pipeline {
     agent any
 
     stages {
-        stage('Do nothing') {
-            steps {
-                sh '/bin/true'
+        stage('build'){
+            steps{
+                sh 'npm install'
+                sh 'npm run build'
             }
         }
+        stage('deploy'){
+            steps{
+sshPublisher(publishers: [sshPublisherDesc(configName: 'Demos', transfers: [sshTransfer(cleanRemote: false, excludes: '', execCommand: '', execTimeout: 120000, flatten: false, makeEmptyDirs: false, noDefaultExcludes: false, patternSeparator: '[, ]+', remoteDirectory: '/home/jenkins/ssh-uploads/calculator', remoteDirectorySDF: false, removePrefix: '', sourceFiles: 'build')], usePromotionTimestamp: false, useWorkspaceInPromotion: false, verbose: false)])
+            
+        }
     }
 }