Refactor/ Update CORS Policy and Database Migrations

[mbsantiago]

This PR addresses CORS configuration and database migration handling, along with introducing a production-ready Docker Compose setup.

Changes:

• CORS: The CORS policy has been updated to allow all origins by default for greater flexibility. Users can now override this and define specific allowed origins using environment variables. This provides a more secure and customizable approach to CORS management.
• Database Migrations: Improved the initial database migration to ensure all datetime fields are correctly defined as timestamp with time zone when using PostgreSQL. This enhances database compatibility and prevents potential timezone-related issues.

Additions:

Production Docker Compose: Added compose.prod.yml to streamline the deployment of a production-ready "whombat" instance. This configuration includes:

• PostgreSQL database integration
• 3 replicas for increased availability and scalability
• A reverse proxy for improved security and performance

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.47%. Comparing base (7fa94d6) to head (0868e7d).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #38   +/-   ##
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  Coverage   66.46%   66.47%           
=======================================
  Files         179      179           
  Lines        8365     8367    +2     
=======================================
+ Hits         5560     5562    +2     
  Misses       2805     2805           

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