Move a zfs setting into the zfs role.

nix/configuration/roles/zfs/default.nix

@@ -44,4 +44,11 @@ in
     zfs_clone_recv
     zfs_clone_resume
   ];
+
+  environment.persistence."/persist" = lib.mkIf (!config.me.buildingIso) {
+    hideMounts = true;
+    directories = [
+      "/etc/zfs/zpool.cache" # Which zpools to import, the root zpool is already imported and does not need this cache file but this captures additional pools.
+    ];
+  };
 }