add Jenkinsfile for docker

Docker/Jenkinsfile

@@ -1,10 +1,19 @@
-pipeline {
-    agent { dockerfile true }
-    stages {
-        stage('Launch Docker') {
-            steps {
-                sh 'ls -la'
+node {    
+      def app     
+      stage('Clone repository') {               
+             
+            checkout scm    
       }  
+    
+      stage('Build image') {         
+       
+            app = docker.build("sparafinski/ium")    
+       } 
+    
+      stage('Test image') {           
+            app.inside {            
+             
+             sh 'echo "Tests passed"'        
             }    
       }     
 }