Add Docker support with automatic Node version detection from .nvmrc

[Copilot]

This PR adds comprehensive Docker support for AllKaraoke with automatic Node version detection from the .nvmrc file, making it easy to build and run the application in a containerized environment.

Features Added

🐳 Docker Configuration

• Dockerfile: Multi-stage build using Node.js Alpine with configurable Node version via build args
• docker-build.sh: Intelligent build script that automatically reads Node version from .nvmrc file
• docker-compose.yml: Complete Docker Compose setup with health checks and environment configuration
• .dockerignore: Optimized build context excluding unnecessary files for faster builds

📋 Node Version Detection

The Docker setup automatically detects and uses the Node version specified in .nvmrc:

# Reads Node version from .nvmrc (currently "20") and builds accordingly
./docker-build.sh

# Manual override also supported
docker build --build-arg NODE_VERSION=18 -t allkaraoke:latest .

🚀 Production-Ready Build Process

• Uses pnpm package manager as specified in the project
• Implements FAST_BUILD=1 flag to skip pre-rendering step (avoids Playwright browser dependencies)
• Optimized layer caching for faster subsequent builds
• Serves production build on port 3010 using pnpm start:production

📚 Documentation & Testing

• DOCKER.md: Comprehensive documentation with usage examples and configuration options
• test-docker-config.sh: Validation script ensuring all Docker files are correctly configured
• docker-demo.sh: Interactive demo showing available Docker commands
• Updated main README.md with Docker setup instructions

Usage Examples

# Quick start with automatic Node version detection
./docker-build.sh
docker run -p 3010:3010 allkaraoke:latest

# Using Docker Compose
docker-compose up

# With custom Node version
NODE_VERSION=18 docker-compose up --build

The application will be available at http://localhost:3010 when running in Docker.

Benefits

• ✅ Consistent development and deployment environment
• ✅ Automatic Node version management from .nvmrc
• ✅ No need to install Node.js or pnpm locally
• ✅ Production-ready configuration with health checks
• ✅ Easy scaling and deployment with Docker Compose

This implementation fully addresses the requirement to "take node version from .nvmrc file if possible" while providing a complete containerization solution for the AllKaraoke application.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• o1.ingest.sentry.io
  • Triggering command: node /home/REDACTED/work/allkaraoke/allkaraoke/node_modules/.bin/../vite/bin/vite.js build (dns block)
  • Triggering command: node ./node_modules/.bin/../vite/bin/vite.js build (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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