Add a RequiredBy dependency for remote-fs.target

m/module/shared-nix-store.nix

@@ -57,6 +57,7 @@
       unitConfig = {
         # We need to wait for the NFS mount
         RequiresMountsFor = "/nix/store /mnt/hut-nix-store"; 
+        RequiredBy = "remote-fs.target";
         Before = "remote-fs.target";
       };
     }