Add microvm data dirs

(untested because virtiofs mounts currently dont work)

machines/fanny/configuration.nix

@@ -57,6 +57,11 @@ in
     };
   };
 
+  systemd.tmpfiles.rules = [ 
+    "L /var/lib/microvms/data - - - - /data/microvms"
+    "d /data/microvms 0755 root root" #not needed for real host?
+    ];
+
   malobeo.initssh = {
     enable = true;
     authorizedKeys = sshKeys.admins;