gitconfig: default branch name set to 'mainline'

home/home.nix

@@ -355,6 +355,7 @@ in
       extraConfig = {
         credential.helper = "cache";
         push.default = "simple";
+        init.defaultBranch = "mainline";
         diff.tool = "vimdiff";
         merge.tool = "vimdiff";
         core.excludesfile = toString (pkgs.writeText ".gitignore_global" ''
@@ -369,6 +370,5 @@ in
         '');
       };
       lfs.enable = true;
-
     };
 }