The linux matrix ran every distro with features in `auto` mode, so any
module whose dependency was missing from the image was silently skipped
and never compiled. Three modules (privacy/pipewire, gps, wwan) were built
by no CI job at all, and several others only on one or two distros.
Add a dedicated `build-full` job (Debian image) that installs the missing
dependencies inline and force-enables every optional feature, turning a
broken include or a missing dep into a hard build error instead of a silent
skip. Drop `debian` from the auto matrix since `build-full` uses the same
image and builds a strict superset.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
