Add REST API, Docker improvements, and CI/CD pipeline

[AnkitaParakh]

• Create markitdown-api package with FastAPI REST API

  • File and URL conversion endpoints
  • Rate limiting and metrics
  • Structured logging and monitoring

• Enhance Docker setup

  • Multi-stage builds
  • Dev and prod configurations
  • Docker Compose setup

• Add GitHub Actions workflows

  • CI pipeline with testing and code quality
  • CD pipeline for PyPI and Docker images

[AnkitaParakh]

Changes Overview

This PR adds several improvements to the MarkItDown project:

1. New REST API Package

• Created markitdown-api package using FastAPI
• Endpoints for file and URL conversion with proper validation
• Built-in rate limiting and file size restrictions
• Comprehensive API documentation with Swagger UI
• Request/response metrics and monitoring

2. Docker Improvements

• Optimized Dockerfile with multi-stage builds
• Added healthchecks for better container monitoring
• Created docker-compose.yml with dev and prod configurations
• Improved security with non-root user
• Better layer caching for faster builds

3. CI/CD Pipeline

• Added GitHub Actions workflows for automated testing
• Code quality checks (black, isort, mypy, ruff)
• Security scanning with Snyk and Bandit
• Automated Docker image builds
• PyPI release automation

4. Monitoring and Logging

• Structured logging with contextual information
• Performance metrics collection
• Health and monitoring endpoints
• Error tracking and categorization

Testing

The changes include automated tests and can be tested locally using:

docker-compose up api-dev

[AnkitaParakh]

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