1fd4524510
deb.yml runs in the Ubuntu rust-ci image whose /bin/sh is dash, where the bash
substring `${GITHUB_SHA::8}` is a "Bad substitution" — the deb build failed at the
Version step every run. Compute the short SHA with `cut` instead. (rpm.yml ran fine
because the Fedora image's /bin/sh is bash, but fix it the same way for robustness.)
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>