mkosi: mask unit from newer versions that gets installed by package

Author: bluca

mkosi.postinst

@@ -21,6 +21,10 @@ EOF
 
     # Make sure dnsmasq.service doesn't start on boot on Debian/Ubuntu.
     rm -f /etc/systemd/system/multi-user.target.wants/dnsmasq.service
+
+    # This unit comes from packages newer than this repository, and is left around as wejust rely on
+    # overwriting from the local build, so disable it manually, as it will fail the CI run
+    systemctl mask systemd-tmpfiles-setup-dev-early.service
 fi
 
 # Temporary workaround until https://github.com/openSUSE/suse-module-tools/commit/158643414ddb8d8208016a5f03a4484d58944d7a