> Set up a nightly cron job that executes the prompt: fetch upstream changes to the <software> and rebase all local changes on top of upstream. Check that the software works as intended and replace the current version.

This sounds like hell. You have unreliable actor redoing the software every night, and every day there is a chance you wake up and find your workflow broken.

And no, "Check that the software works as intended" is not going to cut it, as AI are very, very good at obeying the letter but not the spirit of the ask. Yes, your diffs appear but they lack filenames. You've added this requirements to the prompt? Ok, filenames are back but they are font size 4, unreadably small. You want them well-seen? next week they become size 54, taking entire screen.. This is not a problem with regular AI development - you review the changes and test them a bit. But doing it day-to-day with no overview is just asking for trouble.