use vaultwarden variables for user and group

all-packages.nix

@@ -61,6 +61,7 @@ let
 
     mkVaultwardenWeb = callPackage ./vaultwarden/web.nix {inherit utils;};
     mkVaultwardenService = callPackage ./vaultwarden/unit.nix {inherit utils;};
+    vaultwarden = callPackage ./vaultwarden {inherit utils;};
   };
 in
 self

vaultwarden/default.nix

@@ -0,0 +1,9 @@
+{ pkgs
+, utils
+}:
+{ user ? "vaultwarden"
+, group ? "vaultwarden"
+}:
+{
+  inherit user group;
+}