Added Jenkinsfile for DockerHub + Kubernetes deploy

Jenkinsfile

@@ -2,54 +2,47 @@ pipeline {
     agent any
 
     environment {
-        DOCKERHUB_USER = 'vipin2025devops'
-        IMAGE_NAME = 'myapp'
-        IMAGE_TAG = "latest"
-        K8S_DEPLOYMENT = 'k8s/deployment.yaml'
-        K8S_SERVICE = 'k8s/service.yaml'
+        DOCKERHUB_CREDENTIALS = credentials('dockerhub-creds')
+        DOCKER_IMAGE = "vipin2025devops/myapp"
+        K8S_DEPLOYMENT = "k8s/deployment.yaml"
     }
 
     stages {
-        stage('Checkout Code') {
+        stage('Checkout') {
             steps {
-                checkout scm
+                git branch: 'main', url: 'https://git.opsmonsters.in/vipin.p/my-react-app'
             }
         }
 
         stage('Build Docker Image') {
             steps {
-                powershell """
-                docker build -t ${DOCKERHUB_USER}/${IMAGE_NAME}:${IMAGE_TAG} .
-                """
+                script {
+                    def imageTag = "build-${env.BUILD_NUMBER}"
+                    sh "docker build -t ${DOCKER_IMAGE}:${imageTag} ."
+                    sh "docker tag ${DOCKER_IMAGE}:${imageTag} ${DOCKER_IMAGE}:latest"
+                    env.IMAGE_TAG = imageTag
+                }
             }
         }
 
-        stage('Push Image to Docker Hub') {
+        stage('Push to DockerHub') {
             steps {
-                withCredentials([usernamePassword(credentialsId: 'docker-hub-credentials', usernameVariable: 'DOCKER_USER', passwordVariable: 'DOCKER_PASS')]) {
-                    powershell """
-                    echo $env:DOCKER_PASS | docker login -u $env:DOCKER_USER --password-stdin
-                    docker push ${DOCKERHUB_USER}/${IMAGE_NAME}:${IMAGE_TAG}
-                    """
+                script {
+                    sh "echo $DOCKERHUB_CREDENTIALS_PSW | docker login -u $DOCKERHUB_CREDENTIALS_USR --password-stdin"
+                    sh "docker push ${DOCKER_IMAGE}:${IMAGE_TAG}"
+                    sh "docker push ${DOCKER_IMAGE}:latest"
                 }
             }
         }
 
         stage('Deploy to Kubernetes') {
             steps {
-                powershell """
-                kubectl apply -f ${K8S_DEPLOYMENT}
-                kubectl apply -f ${K8S_SERVICE}
+                script {
+                    sh """
+                    sed 's|IMAGE_PLACEHOLDER|${DOCKER_IMAGE}:${IMAGE_TAG}|g' ${K8S_DEPLOYMENT} | kubectl apply -f -
                     """
                 }
             }
-
-        stage('Verify Deployment') {
-            steps {
-                powershell """
-                kubectl get pods -o wide
-                """
-            }
         }
     }
 }