vars: don't use sops.secrets.*.restartUnits on macOS

nixosModules/clanCore/vars/secret/sops/default.nix

@@ -1,4 +1,5 @@
 {
+  _class,
   config,
   lib,
   pkgs,
@@ -42,20 +43,23 @@ in
     secrets = lib.listToAttrs (
       map (secret: {
         name = "vars/${secret.generator}/${secret.name}";
-        value = {
-          inherit (secret)
-            owner
-            group
-            mode
-            neededForUsers
-            restartUnits
-            ;
-          sopsFile = builtins.path {
-            name = "${secret.generator}_${secret.name}";
-            path = secretPath secret;
-          };
-          format = "binary";
-        };
+        value =
+          {
+            inherit (secret)
+              owner
+              group
+              mode
+              neededForUsers
+              ;
+            sopsFile = builtins.path {
+              name = "${secret.generator}_${secret.name}";
+              path = secretPath secret;
+            };
+            format = "binary";
+          }
+          // (lib.optionalAttrs (_class == "nixos") {
+            inherit (secret) restartUnits;
+          });
       }) (builtins.filter (x: builtins.pathExists (secretPath x)) vars)
     );