Update README.md

Dockerfile

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+FROM node:18-alpine
+WORKDIR /app
+COPY . .
+RUN yarn install --production && yarn cache clean
+ENTRYPOINT [ "node" ]
+CMD [ "src/index.js" ]
+EXPOSE 3000

README.md

@@ -1,5 +1,99 @@
-# Getting started
 
-This repository is a sample application for users following the getting started guide at https://docs.docker.com/get-started/.
+# Getting Started
 
-The application is based on the application from the getting started tutorial at https://github.com/docker/getting-started
+This repository is a sample application for users following the [Getting Started guide](https://docs.docker.com/get-started/) on Docker's official documentation.
+
+The application is based on the tutorial at [docker/getting-started](https://github.com/docker/getting-started).
+
+## Getting Started App with Docker CI/CD
+
+This project demonstrates how to build, test, and deploy a Dockerized application using GitHub Actions for CI/CD.
+
+### How to Fork and Set Up
+
+1. **Fork the repository:**
+   - Go to the [docker/getting-started-app](https://github.com/docker/getting-started-app) and fork the repository to your GitHub account.
+
+2. **Set the remote URL:**
+   - After forking, change the remote URL to your repository in the terminal:
+     ```bash
+     git remote set-url origin https://github.com/abohmeed/getting-started-app.git
+     ```
+
+3. **View the Dockerfile:**
+   - In the terminal, view the Dockerfile:
+     ```bash
+     cat Dockerfile
+     ```
+
+### Dockerfile
+
+Here’s the `Dockerfile` included in this project:
+
+```dockerfile
+FROM node:18-alpine
+WORKDIR /app
+COPY . .
+RUN yarn install --production && yarn cache clean
+ENTRYPOINT [ "node" ]
+CMD [ "src/index.js" ]
+EXPOSE 3000
+```
+
+### GitHub Actions CI/CD Workflow
+
+This project includes a GitHub Actions workflow for automatically building and pushing Docker images to the GitHub Container Registry.
+
+#### Workflow File
+
+The `.github/workflows/docker-image.yml` file contains the CI/CD pipeline:
+
+```yaml
+name: Docker Image CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    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@v3
+
+    - name: Log in to GitHub Container Registry
+      uses: docker/login-action@v3
+      with:
+        registry: ghcr.io
+        username: ${{ github.repository_owner }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Build and push Docker image
+      uses: docker/build-push-action@v5
+      with:
+        context: .
+        push: true
+        tags: |
+          ghcr.io/${{ github.repository_owner }}/abohmeed/getting-started:latest
+          ghcr.io/${{ github.repository_owner }}/abohmeed/getting-started:${{ github.sha }}
+```
+
+### Workflow Steps:
+
+- **Checkout code:** Fetches the repository content.
+- **Set up Docker Buildx:** Prepares Docker Buildx for multi-platform builds.
+- **Log in to GitHub Container Registry:** Authenticates the Docker client with GitHub’s Container Registry.
+- **Build and push:** Builds the Docker image and pushes it to the GitHub Container Registry with two tags: `latest` and the commit SHA.
+
+### Conclusion
+
+This setup allows you to continuously integrate and deploy Docker images to the GitHub Container Registry. Simply push or open a pull request to the `main` branch, and the workflow will handle the rest!