Add MaxMind database files to Git

[blag]

Cache mmdb files in git to speed up CI tests

Description

Instead of constantly regenerating the MaxMind database fixtures in the GHA test workflow, just commit them and let pre-commit check if they need to be updated.

Generally speaking, it's not a great idea to commit binary files to Git, but I only expect these files to change very rarely (or never), and they are 2.7kB and 2.5kB, respectively. So I don't think this will be a big deal.

To double check that the MMDB files don't need to be updated, I added that as a pre-commit check. It uses make to avoid doing any work unless the Dockerfile or the Perl script have been touched.

It should be noted that even regenerating the mmdb files does change them, so reproducible builds aren't currently possible AFAIK.

Types of changes

• Code improvement

Checklist:

• All new and existing tests passed.

[codecov]

Codecov Report

Merging #177 (7d8e466) into master (eb315b2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #177   +/-   ##
=======================================
  Coverage   97.67%   97.67%           
=======================================
  Files          17       17           
  Lines         689      689           
  Branches       56       56           
=======================================
  Hits          673      673           
  Misses         10       10           
  Partials        6        6           

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[WhyNotHugo]

Can't CI just cache the files without them being in the repository?

[blag]

Yes, but only for 7 days. And given how infrequently this repository is updated, that means the cached files will never exist, and always be regenerated, which isn't any better than what we do now.

But, since this repository is so infrequently updated, I guess this only provides minor value as well.

Closing, since I've switched over to using django-qsessions instead anyway.