ISO history: fix?

Originally created by @CyrilBrulebois on #17687 (Redmine)

See tails#17686 (closed) (parent task) for context, and #17414 (closed) which was about slow networking in general when releasing.

This ticket is specifically about trying to fix the incredible performance issues we can get when it’s time to push data to the git-annex powered ISO history repository.

Assigning to Sysadmins for the time being.

Parent Task: tails#17686 (closed)

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