Misc: Add nixfmt-tree and run nix fmt

modules/programs/docker.nix

@@ -4,11 +4,8 @@
       enable = true;
       autoPrune.enable = true;
     };
-    users.users =
-      lib.genAttrs
-        users
-        (_: {
-          extraGroups = [ "docker" ];
-        });
+    users.users = lib.genAttrs users (_: {
+      extraGroups = [ "docker" ];
+    });
   };
 }