Update mirrorbrain

[benoit74]

⚠️ Do not merge before kiwix/mirrorbrain#1 is ready and released. 🦺

Fix #244
Fix #251

Changes :

• update base image from httpd:2.4.43 to 2.4.57
  • this includes a move to Debian Bookworm
  • and hence an update to Python 3 (Python 2 is dropped in Bookworm)
• replace python2 packages by python3 ones
• move to MaxMind GeoIP2
  • remove geoip-api-c and mod_geoip2
  • add libmaxminddb (C library), geoipupdate (tooling to fetch / update MaxMind DBs) and mod_maxminddb
• remove obsolete tools geoiplookup_continent, geoiplookup_city and geoip-lite-update
• copy new MB assets to a /var/www subfolder
• modify mirror list generation so that we have to pass a custom HTML header template (which will reference the proper base URL where assets will be located, probably https://download.kiwix.org)
• created a mirrorbrain/dev folder containing a minimal docker-compose setup to test Mirrorbrain locally

[rgaudin]

I've updated the versions of the base image and the libraries.
I've put it on a separate tag (:bookworm).

As discussed with @benoit74, there's no real way to properly test this outside of production. The goal is thus to try this live, monitor it and quickly revert to latest on issues (and iterate).

It is acknowledged that we it should not disturb downloads delivery much:

• apache module code has not changed beside switching to MMDB and this has been tested.
• apache API is very stable so upgrade should not have impact

The other tools we use being:

• mirrorprobe: changes were syntax only but it does import mb
• mb scan (via update_mirrorbrain_db.sh): heavy work is deffered to a perl script but a lot still done in python script.
• mb mirrorlist: this was tested
• geoipupdate: that's the the maxmind binary. We need to ensure this executes properly and its results are properly used by mod_mb (we use default paths)
• mb makehashes: we'll need to be careful about this working properly. hashes can easily be tested but btih are also computed there