debian: include all boot-related configs in the package

This especially adds dracut config (that was previously installed in
Fedora only). While dracut is not the default on Debian, it is possible
to use it, so add the config to the package too.

QubesOS/qubes-issues#8649

(cherry picked from commit 8796b2b)

debian/qubes-core-agent.install

@@ -138,6 +138,7 @@ usr/bin/qvm-run-vm
 usr/bin/qvm-connect-tcp
 usr/bin/qvm-sync-clock
 usr/lib/environment.d/60-gnome-software-fix.conf
+usr/lib/dracut/dracut.conf.d/30-qubes.conf
 usr/lib/python3/dist-packages/qubesagent-*.egg-info/*
 usr/lib/python3/dist-packages/qubesagent/*
 usr/lib/qubes-bind-dirs.d/30_cron.conf

debian/rules

@@ -30,7 +30,7 @@ override_dh_auto_install:
 	make -C qubes-rpc/kde install
 	make -C qubes-rpc/nautilus install
 	make -C qubes-rpc/thunar install
-	install -D -m 0644 boot/grub.qubes $(DESTDIR)/etc/default/grub.d/30-qubes.cfg
+	make -C boot install GRUBCFGNAME=grub.d/30-qubes.cfg
 
 override_dh_fixperms:
 	dh_fixperms -a -Xqfile-unpacker