fix for read-write on initrd

https://www.redhat.com/archives/libvir-list/2020-July/msg00451.html

nixos/default.nix

@@ -30,6 +30,7 @@ in with lib; {
         namespaces = []
         user = "${cfg.user}"
         group = "users"
+        remember_owner = 0
       '';
     };