Dockerize the Python FastAPI Album API application

[Copilot]

This PR adds complete Docker support to the Python FastAPI Album API application, enabling containerized deployment and development.

Changes Made

New Files Added:

• Dockerfile - Multi-stage Docker build configuration using Python 3.11 slim base image
• .dockerignore - Excludes unnecessary files from Docker build context (Git files, IDE configs, documentation, Python cache, etc.)
• docker-compose.yml - Simplified container orchestration for local development
• Updated README.md - Added comprehensive Docker usage instructions and examples

Key Features:

• Optimized Docker Image: Uses Python 3.11 slim for minimal size while maintaining compatibility
• Secure Package Installation: Handles SSL certificate issues with trusted PyPI hosts
• Proper Layer Caching: Requirements installed before copying source code for better build performance
• Port Configuration: Exposes port 8000 for API access
• Development Ready: Docker Compose setup with optional volume mounting for live development

Usage Examples:

Build and run with Docker:

docker build -t albumapi-python .
docker run -p 8000:8000 albumapi-python

Or use Docker Compose for easier management:

docker compose up

Testing Verified:

• ✅ Docker build completes successfully
• ✅ Container runs and serves API on port 8000
• ✅ Both endpoints (/ and /albums) return expected responses
• ✅ Docker Compose orchestration works correctly
• ✅ Application behavior identical to local Python execution

The containerized application maintains full compatibility with the existing FastAPI implementation while adding the flexibility of Docker deployment for various environments including Azure Container Apps.

Fixes #1.

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