Generate a Git repo with commits and branches for the decompiled source code of different Minecraft versions and mappings.
Currently the only branches generated are mojmap and authlib.
decompiled-minecraft-gen will create the full repository of decompiled Minecraft versions at ./repo on run (with cargo r -r).
The first time you run it, it'll take a few hours.
If the repository already exists at that location, it'll update it to the latest snapshot (or if it's up-to-date, it won't do anything).
It'll run git push --all after it updates.
Having a recent version of Java installed is required.