Added jenkins file

Dockerfile

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+# Stage 1: Build React App
+FROM node:18-alpine AS build
+
+# Set working directory
+WORKDIR /app
+
+# Copy only package files for layer caching
+COPY package*.json ./
+
+# Optional: clean npm cache
+RUN npm cache clean --force
+
+# Install specific versions to avoid breaking changes
+RUN npm install ajv@6 ajv-keywords@3 --legacy-peer-deps
+
+# Skip postinstall scripts (which cause workspace errors)
+ENV NPM_CONFIG_IGNORE_SCRIPTS=true
+
+# Install dependencies with legacy peer deps
+RUN npm install --legacy-peer-deps || true
+
+# Copy rest of the app
+COPY . .
+
+# Build the React app
+RUN npm run build
+
+# Stage 2: Serve with Nginx
+FROM nginx:alpine
+
+# Remove default nginx files
+RUN rm -rf /usr/share/nginx/html/*
+
+# Copy build output from previous stage
+COPY --from=build /app/build /usr/share/nginx/html
+
+# Optional: copy custom nginx config
+# COPY nginx.conf /etc/nginx/nginx.conf
+
+# Expose port 80
+EXPOSE 80
+
+# Start Nginx
+CMD ["nginx", "-g", "daemon off;"]

jenkinsfile

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+pipeline {
+    agent any
+
+    stages {
+        stage('Clone Repository') {
+            steps {
+                git branch: 'main', url: 'https://github.com/Rachana-js/create-react-app.git'
+            }
+        }
+
+        stage('Build Docker Image') {
+            steps {
+                sh 'docker build -t rachanajs/react-app .'
+            }
+        }
+
+        stage('Push to Docker Hub') {
+            steps {
+                withDockerRegistry([credentialsId: 'docker-hub-credentials', url: '']) {
+                    sh 'docker push rachanajs/react-app'
+                }
+            }
+        }
+
+        stage('Deploy with Docker') {
+            steps {
+                sh '''
+                    docker ps -q --filter "ancestor=rachanajs/react-app" | xargs -r docker stop
+                    docker run -d -p 3000:3000 rachanajs/react-app
+                '''
+            }
+        }
+    }
+}