🐛 publish: fix exit status integer overflow

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publish.py currently uses the number of failed verifications as exit
status. `sys.exit(failed)` Whenever the number of failed verification
attempts is divisible by 256 the return status is 0. exit status 0
however conveys that there were no errors, so as long as an attacker can
controll the number of verification failures they can use this to turn
off verification alltogether.

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500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f