Since April 2022/CVE-2022-24765, git refuses to work in directories
whose owner != the current user, unless explicitly told to trust it.
This patches the create-release script to trust the /build/source
dir mounted from the hosting OS, whose userid is inevitably different
from that of the account in the container running git.
Contributed by: Steve Loughran, Ayush Saxena and the new git error messages
d7fd61d616