mkosi: Make sure systemd-resolved is started on boot

Author: DaanDeMeyer

mkosi.images/system/mkosi.extra/usr/lib/systemd/system-preset/00-mkosi.preset

@@ -19,6 +19,9 @@ enable dbus-broker.service
 enable systemd-networkd.service
 enable systemd-networkd-wait-online.service
 
+# systemd-resolved is disable by default on CentOS so make sure it is enabled.
+enable systemd-resolved.service
+
 # We install dnf in some images but it's only going to be used rarely,
 # so let's not have dnf create its cache.
 disable dnf-makecache.*