Create Docker deployment infrastructure

This commit provides production-ready Docker deployment for the HTTP MCP wrapper.

Components:
- Dockerfile: Multi-stage build for optimized image size
  - Builder stage: Compiles dependencies and installs packages
  - Production stage: Minimal runtime image with only necessary files
  - Python 3.11 slim base image
  - Health check endpoint integration
  - Proper Python environment variables (unbuffered, no bytecode)

- docker-compose.yml: Complete orchestration setup
  - Service configuration with restart policy
  - Port mapping (8000:8000)
  - Environment variable passthrough
  - Health check configuration
  - Isolated network
  - Ready for production deployment

- .dockerignore: Optimized build context
  - Excludes Python cache, virtual environments, IDE files
  - Excludes tests and documentation
  - Reduces image size and build time

- .env.docker.example: Docker-specific environment template
  - All required Gitea configuration
  - Optional authentication settings
  - Optional tool filtering settings

Deployment:
1. Copy .env.docker.example to .env
2. Fill in Gitea credentials
3. Run: docker-compose up -d
4. Access at http://localhost:8000

This infrastructure enables easy deployment to any Docker-compatible environment (local, cloud, Kubernetes).

Closes #15

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,43 @@
+version: '3.8'
+
+services:
+  gitea-mcp-wrapper:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    image: gitea-mcp-wrapper:latest
+    container_name: gitea-mcp-wrapper
+    restart: unless-stopped
+    ports:
+      - "8000:8000"
+    environment:
+      # Gitea Configuration
+      - GITEA_URL=${GITEA_URL}
+      - GITEA_TOKEN=${GITEA_TOKEN}
+      - GITEA_OWNER=${GITEA_OWNER}
+      - GITEA_REPO=${GITEA_REPO}
+
+      # HTTP Server Configuration
+      - HTTP_HOST=0.0.0.0
+      - HTTP_PORT=8000
+
+      # Authentication (Optional)
+      - AUTH_TOKEN=${AUTH_TOKEN:-}
+
+      # Tool Filtering (Optional)
+      - ENABLED_TOOLS=${ENABLED_TOOLS:-}
+      - DISABLED_TOOLS=${DISABLED_TOOLS:-}
+
+    healthcheck:
+      test: ["CMD", "python", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:8000/health').read()"]
+      interval: 30s
+      timeout: 3s
+      retries: 3
+      start_period: 5s
+
+    networks:
+      - gitea-mcp-network
+
+networks:
+  gitea-mcp-network:
+    driver: bridge