Add Jenkinsfile for CI/CD pipeline

Jenkinsfile

@@ -0,0 +1,37 @@
+pipeline {
+    agent any
+    environment {
+        REGISTRY = "docker.rri.co.id"
+        IMAGE_NAME = "ci3-app"
+        IMAGE_TAG = "latest"
+        KUBE_NAMESPACE = "default"
+        DEPLOYMENT_NAME = "ci3-deployment"
+    }
+    stages {
+        stage('Checkout') {
+            steps {
+                git url: 'http://git.rri.co.id/admin/ci3-app.git'
+            }
+        }
+        stage('Build Docker Image') {
+            steps {
+                sh "docker build -t ${REGISTRY}/${IMAGE_NAME}:${IMAGE_TAG} ."
+            }
+        }
+        stage('Push Image') {
+            steps {
+                withCredentials([usernamePassword(credentialsId: 'docker-credentials', usernameVariable: 'DOCKER_USER', passwordVariable: 'DOCKER_PASS')]) {
+                    sh """
+                    echo \$DOCKER_PASS | docker login ${REGISTRY} -u \$DOCKER_USER --password-stdin
+                    docker push ${REGISTRY}/${IMAGE_NAME}:${IMAGE_TAG}
+                    """
+                }
+            }
+        }
+        stage('Deploy to Kubernetes') {
+            steps {
+                sh "kubectl set image deployment/${DEPLOYMENT_NAME} php=${REGISTRY}/${IMAGE_NAME}:${IMAGE_TAG} -n ${KUBE_NAMESPACE}"
+            }
+        }
+    }
+}