mkosi: pull in new knot package for TEST-75-RESOLVED

5728s TEST-75-RESOLVED.sh[439]: /usr/lib/systemd/tests/testdata/units/TEST-75-RESOLVED.sh: line 154: keymgr: command not found

The command was split out into a new package

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

@@ -0,0 +1,26 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+# New package needed for TEST-75-RESOLVED
+
+[TriggerMatch]
+Distribution=debian
+Release=!bullseye
+Release=!bookworm
+Release=!trixie
+# TODO: drop once Duke ships
+Release=!oldstable
+# TODO: drop once Forky ships
+Release=!stable
+
+[TriggerMatch]
+Distribution=ubuntu
+Release=!jammy
+Release=!noble
+Release=!plucky
+Release=!questing
+
+[TriggerMatch]
+Distribution=kali
+
+[Content]
+Packages=knot-keymgr