npm init -y

const http = require('http');
const server = http.createServer((req, res) => {
  res.end('Hello from Docker and GitHub Actions');
});
server.listen(3000, () => { console.log('Server is running on port 3000'); });

"scripts": {
  "start": "node index.js"
}

node index.js

git init
git add .
git commit -m "first commit"
git branch -M main
git remote add origin <your-repo-url>
git push -u origin main

name: Build and Push Docker Image
on:
  push:
    branches:
      - main
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v3
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2
      - name: Login to DockerHub
        uses: docker/login-action@v2
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}
      - name: Build and push Docker image
        uses: docker/build-push-action@v5
        with:
          push: true
          tags: yourusername/my-node-app:latest