mkosi: install bpftool in Debian/Ubuntu test images

The centos-fedora, opensuse and postmarketos image configurations all
install bpftool but the Debian/Ubuntu ones never did. Only their build
image gets it via the packaging's Build-Depends. So the
TEST-90-RESTRICT-FSACCESS guard and overlay subtests, both gated on
'command -v bpftool', just silently skip there.

Mirror what the build image does. Plain bpftool everywhere except Ubuntu
jammy and noble which still bundle it in linux-tools-generic.

Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

mkosi/mkosi.conf.d/debian-ubuntu/mkosi.conf.d/bpftool.conf

@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+# bpftool was untangled in resolute; Debian ships it standalone everywhere
+
+[TriggerMatch]
+Distribution=debian
+
+[TriggerMatch]
+Distribution=ubuntu
+Release=!jammy
+Release=!noble
+
+[Content]
+Packages=bpftool

mkosi/mkosi.conf.d/debian-ubuntu/mkosi.conf.d/linux-tools-generic.conf

@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+# bpftool was untangled in resolute, needs linux-tools-generic in older releases
+
+[TriggerMatch]
+Distribution=ubuntu
+Release=|jammy
+Release=|noble
+
+[Content]
+Packages=linux-tools-generic