Add Jenkinsfile

Jenkinsfile

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+pipeline {
+    // 1. Run on your specific agent
+    agent { label 'jenkins-agent' }
+
+    environment {
+        REGISTRY_URL = 'registry.digitalocean.com/kongseng'
+        
+        // 2. Dynamic Naming: Image tag includes Branch Name to prevent conflicts
+        // Example: registry.../backend:Dev-42 or registry.../backend:main-42
+        BACKEND_IMAGE = "${REGISTRY_URL}/devsecops-backend:${env.BRANCH_NAME}-${env.BUILD_NUMBER}"
+        FRONTEND_IMAGE = "${REGISTRY_URL}/devsecops-frontend:${env.BRANCH_NAME}-${env.BUILD_NUMBER}"
+    }
+    
+    stages {
+        stage('Checkout') {
+            steps {
+                checkout scm
+            }
+        }
+        
+        stage('Install Dependencies') {
+            steps {
+                echo "Installing dependencies for ${env.BRANCH_NAME} branch..."
+                dir('backend') { sh 'npm install' }
+                dir('frontend') { sh 'npm install' }
+            }
+        }
+        
+        stage('Build Docker Images') {
+            steps {
+                script {
+                    echo "Building Images for branch: ${env.BRANCH_NAME}..."
+                    sh "docker build -t ${BACKEND_IMAGE} ./backend"
+                    sh "docker build -t ${FRONTEND_IMAGE} ./frontend"
+                }
+            }
+        }
+
+        stage('Push to Registry') {
+            steps {
+                script {
+                    echo "Pushing images to DigitalOcean..."
+                    sh "docker push ${BACKEND_IMAGE}"
+                    sh "docker push ${FRONTEND_IMAGE}"
+                }
+            }
+        }
+        
+        // --- DYNAMIC DEPLOYMENT ---
+        stage('Deploy') {
+            steps {
+                script {
+                    // Define ports and names based on the branch
+                    def appPort = "3000" // Fallback
+                    def containerName = "backend-app"
+                    
+                    if (env.BRANCH_NAME == 'Dev') {
+                        appPort = "3001"
+                        containerName = "backend-dev"
+                        echo "Deploying to DEV Environment (Port 3001)"
+                    } 
+                    else if (env.BRANCH_NAME == 'Release') {
+                        appPort = "3002"
+                        containerName = "backend-release"
+                        echo "Deploying to STAGING Environment (Port 3002)"
+                    } 
+                    else if (env.BRANCH_NAME == 'main') {
+                        appPort = "3003"
+                        containerName = "backend-prod"
+                        echo "Deploying to PRODUCTION Environment (Port 3003)"
+                    }
+                    else {
+                         // Logic for any future feature branches
+                        appPort = "3004"
+                        containerName = "backend-feature-${env.BRANCH_NAME}"
+                        echo "Deploying Feature Branch"
+                    }
+
+                    // 1. Clean up old container
+                    try {
+                        sh "docker stop ${containerName} || true"
+                        sh "docker rm ${containerName} || true"
+                    } catch (Exception e) {
+                        echo "No container to stop"
+                    }
+
+                    // 2. Run new container on the assigned port
+                    sh """
+                        docker run -d \
+                        --name ${containerName} \
+                        --restart always \
+                        -p ${appPort}:3000 \
+                        ${BACKEND_IMAGE}
+                    """
+                }
+            }
+        }
+    }
+}