Add Docker support for GQL server

[konard]

🐳 Docker Implementation for GQL Server

This PR adds complete Docker support for the Data.Doublets.Gql server, making it easy to deploy and run in containerized environments.

📋 Issue Reference

Fixes #32

✨ Implementation Details

🏗️ Docker Configuration

• Dockerfile: Multi-stage build using .NET 6 SDK for building and .NET 6 runtime for final image
• docker-compose.yml: Easy deployment with volume persistence and health checks
• .dockerignore: Optimized build context excluding unnecessary files

📦 Features

• Volume Persistence: Database files stored in ./data directory on host machine
• Port Mapping: Container port 80 mapped to host port 29018 (matching production server)
• Health Check: Automated health monitoring via playground endpoint
• Environment Configuration: Proper ASP.NET Core environment settings

🚀 Usage Options

Option 1: Docker Compose (Recommended)

docker-compose up -d

Option 2: Manual Docker Build

docker build -t doublets-gql .
docker run -p 29018:80 -v $(pwd)/data:/app/data doublets-gql

🌐 Access Points

After starting the container, access the server at:

• GraphQL Playground: http://localhost:29018/ui/playground
• GraphiQL: http://localhost:29018/ui/graphiql
• Altair: http://localhost:29018/ui/altair
• Voyager: http://localhost:29018/ui/voyager
• GraphQL Endpoint: http://localhost:29018/v1/graphql

📝 Documentation Updates

• Updated README.md with Docker deployment instructions
• Added both Docker and traditional .NET deployment methods
• Clear step-by-step instructions for different deployment scenarios

🔧 Technical Details

• Uses .NET 6 runtime for optimal performance
• Database files automatically stored in persistent volume
• Proper CORS configuration for web UI access
• Production-ready configuration with health monitoring

✅ Testing

• Dockerfile builds successfully with proper multi-stage approach
• All GraphQL endpoints properly configured and accessible
• Volume mounting ensures data persistence across container restarts

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