abuild-keygen set -e change breaks $USER fallback
In commit 754270e4 a set -e line is added to abort early on errors, but it has the side effect of making it impossible to reach the $USER fallback at https://gitlab.alpinelinux.org/alpine/abuild/-/blob/master/abuild-keygen.in#L33 because it would fail on the git command
This fallback was used by postmarketOS ofcourse :D