feat(forgejo): rename forgejo user to git

modules/nixos/features/forgejo.nix

@@ -29,9 +29,11 @@ in
         };
         service.DISABLE_REGISTRATION = true;
       };
+      user = "git";
+      group = "git";
     };
 
-    openssh.settings.AllowUsers = [ "forgejo" ];
+    openssh.settings.AllowUsers = [ "git" ];
 
     borgbackup.jobs = {
       onsite.paths = [ "/var/lib/forgejo" ];
@@ -45,4 +47,14 @@ in
       }
     '';
   };
+
+  users = {
+    users.git = {
+      home = "/var/lib/forgejo";
+      useDefaultShell = true;
+      group = "git";
+      isSystemUser = true;
+    };
+    groups.git = { };
+  };
 }