versions repo sharding

[michielbdejong]

Since our snapshots and versions repos are so big, for robustness, I think we need to shard them into multiple smaller ones (e.g. one for each letter of the alphabet, or e.g. 100 repos sharding based on mod of hash of service name)

[michielbdejong]

Now that we're running without snapshots thanks to OpenTermsArchive/engine#1104 this would only apply to the versions repo.

A simpler thing to do would be to give the npx ota track command extra options to filter and shard on service name hash, or at least to start (and finish) in a random place in the alphabet.

[michielbdejong]

I shared the cron job instead