Add a jenkinsfile for Jenkins CI build (#41)

Jenkinsfile

@@ -0,0 +1,35 @@
+pipeline {
+    agent any
+
+    environment {
+        DOCKER_HUB_CREDENTIAL = credentials('dockerHub')
+    }
+
+    tools {
+        nodejs 'nodejs_24'
+    }
+
+    options {
+        // Configure an overall timeout for the build.
+        timeout(time: 1, unit: 'HOURS')
+        disableConcurrentBuilds()
+    }
+    
+    stages {
+        stage('Compile') {
+            steps {
+                sh 'npm install'
+            }
+        }
+        stage('Test') {
+            steps {
+                sh 'npm run test'
+            }
+        }
+    }
+    post {
+        always {
+            deleteDir() /* clean up our workspace */
+        }
+    }
+}