docs: Add Docker deployment instructions and build script

- Add build-and-push-docker.ps1 PowerShell script for automated Docker builds
- Update README.md with comprehensive Docker deployment guide
- Include environment variable configuration
- Document automated email scheduling in containers
- Add GitHub Container Registry push instructions

README.md

@@ -244,6 +244,62 @@ npm run build
 
 Deploy to Vercel or any platform supporting Next.js PWAs.
 
+## Docker Deployment
+
+The app includes Docker support for containerized deployment with automated email scheduling.
+
+### Build and Push Docker Image
+
+1. **Using the automated script (Windows):**
+   ```powershell
+   .\build-and-push-docker.ps1
+   ```
+   This script will:
+   - Build the Docker image
+   - Prompt for your GitHub Personal Access Token
+   - Login to GitHub Container Registry
+   - Push the image
+
+2. **Manual build and push:**
+   ```bash
+   # Build the image
+   docker build -t ghcr.io/nmemmert/prayer-app:latest .
+   
+   # Login to GitHub Container Registry
+   echo $GITHUB_TOKEN | docker login ghcr.io -u nmemmert --password-stdin
+   
+   # Push the image
+   docker push ghcr.io/nmemmert/prayer-app:latest
+   ```
+
+### Run with Docker Compose
+
+```bash
+docker-compose up -d
+```
+
+The container includes:
+- Automated email scheduling (runs every 5 minutes)
+- Health checks
+- Production-optimized Next.js build
+- Cron jobs for scheduled tasks
+
+### Environment Variables
+
+Set these environment variables for the container:
+
+```bash
+# Firebase Admin SDK (required for server-side operations)
+FIREBASE_PROJECT_ID=your_project_id
+FIREBASE_PRIVATE_KEY="-----BEGIN PRIVATE KEY-----\n..."
+FIREBASE_CLIENT_EMAIL=your_service_account_email
+
+# EmailJS (for client-side emails)
+NEXT_PUBLIC_EMAILJS_SERVICE_ID=your_service_id
+NEXT_PUBLIC_EMAILJS_TEMPLATE_ID=your_template_id
+NEXT_PUBLIC_EMAILJS_PUBLIC_KEY=your_public_key
+```
+
 ## Learn More
 
 To learn more about Next.js, take a look at the following resources: