feat: Dockerize application for development

[RandomProgramm3r]

This commit introduces a complete Docker and Docker Compose setup, enabling developers to build, run, and test the application in a consistent, isolated environment. It also prepares the application for containerized deployments.

Changes include:

• Dockerfile: A multi-stage build process is implemented. It separates build-time dependencies from the final runtime image, creating a smaller and more secure production artifact. gunicorn is used as the application server.
• docker-compose.yml: Defines the app and redis services, linking them together.
• settings.py:
  • Configured to connect to the Redis service for Django's caching backend. - Added settings for the Anti-fraud service URLs. - All new configurations (Redis URL, Anti-fraud URLs) are driven by environment variables for flexibility and security, with sensible defaults for local development.
• requirements/prod.txt: Added django-redis and requests.
• .dockerignore: Updated to exclude unnecessary files from the Docker build context, ensuring faster and smaller builds.