Add Jenkinsfile: build/test/deploy pipeline

Jenkinsfile

@@ -0,0 +1,26 @@
+pipeline {
+  agent any
+  options {
+    timestamps()
+    disableConcurrentBuilds()
+  }
+  stages {
+    stage('Build & Test') {
+      steps {
+        sh 'chmod +x gradlew'
+        sh './gradlew clean build --no-daemon'
+      }
+    }
+    stage('Deploy') {
+      steps {
+        sh '''
+          set -e
+          JAR=$(ls build/libs/h-lab-*.jar | grep -v plain | head -1)
+          echo "Deploying: $JAR"
+          docker cp "$JAR" springboot-app:/app/app.jar
+          docker restart springboot-app
+        '''
+      }
+    }
+  }
+}