Added timezone information to the available fields

[skinny]

My use case also uses the timezone information (available on ipinfo.io) but was not yet available in this self hosted soltution. This PR downloads the City geo database and uses that to return a "best guess" timezone for the users IP.

Summary by CodeRabbit

• New Features
  • Integrated GeoLite2-City database to enhance geo-location services.
  • Added a new /timezone endpoint for retrieving user time zone information.
  • Updated the /json endpoint to include timezone information in responses.
  • Improved Dockerfile to automate GeoLite2-City database setup.
  • Enhanced nginx configuration to utilize GeoLite2-City.mmdb for accurate time zone retrieval.

[coderabbitai[bot]]

Walkthrough

The recent updates enhance the application's geolocation capabilities by integrating the GeoLite2-City database into the Docker setup, and configuring nginx to utilize this database for time zone information retrieval. A new endpoint and additional response fields have been introduced to provide users with time zone data based on their IP addresses, enriching the application's geospatial functionalities.

Changes

Files	Change Summary
Dockerfile, nginx/conf.d/geoip2.conf	Added steps for downloading, verifying, and extracting the GeoLite2-City database in the Dockerfile. Added functionality to load and use the GeoLite2-City.mmdb database for time zone retrieval in nginx configuration.

🌍🐰✨
In the world of code, where data streams flow,
A rabbit hopped in, with updates in tow.
"Behold," it said, "for time zones we cater,
With GeoLite2-City, we're now the navigator.
Through nginx paths, our journey we chart,
Bringing time zones close, though miles apart."
🌐🕒💫
🐇📦🔍

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[skinny]

@PeterDaveHello removed the comments, newlines and added a bit of documentation on the timezone field