daedalus-v4l2-dkms: postinst — autoinstall for all installed kernels (#64)

Previously dkms autoinstall ran only against $(uname -r), so installing
the package on kernel A and rebooting into separately-installed kernel B
left /lib/modules/B/updates/dkms/ empty.  /dev/daedalus-v4l2 absent,
daedalus daemon nothing to talk to, browser/VAAPI silently falling back
to software with no obvious diagnostic for the user.

Now we enumerate every /lib/modules/*/build that resolves to a real
directory (i.e. headers are actually installed for that kernel) and run
'dkms autoinstall -k <kver>' for each.  Per-kernel verify; aggregated
warning only for the kernels that didn't build.

Tested locally: enumeration filters dangling /build symlinks correctly
(2 kernels installed, 1 has headers → only that one is built against).

Bumps PKGREL 1 → 2.  Closes #64.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

debian/daedalus-v4l2-dkms/debian/changelog

@@ -1,3 +1,18 @@
+daedalus-v4l2-dkms (0.1.0+r24+gf0d4186-2) bookworm trixie; urgency=medium
+
+  * postinst: autoinstall for every installed kernel with headers, not
+    just the running one.  Previously `dkms autoinstall $NAME/$VERSION`
+    built only against `$(uname -r)`, so installing the package on
+    kernel A and then rebooting into a separately-installed kernel B
+    left /lib/modules/B/updates/dkms/ empty — /dev/daedalus-v4l2 absent,
+    daedalus daemon nothing to talk to, browser/VAAPI silently falling
+    back to software with no obvious diagnostic.  Now we enumerate every
+    /lib/modules/*/build that resolves to a real directory and run
+    `dkms autoinstall -k <kver>` for each, reporting per-kernel failure
+    only when headers are missing.  Closes #64.
+
+ -- Markus Fritsche <mfritsche@reauktion.de>  Thu, 21 May 2026 09:30:00 +0000
+
 daedalus-v4l2-dkms (0.1.0+r24+gf0d4186-1) bookworm trixie; urgency=medium
 
   * Bump to f0d4186 — per-ctx vb2 lock fix.  daedalus_queue_init now