move git to own mod

nixosModules/default.nix

@@ -9,6 +9,7 @@
     ./en-de.nix
     ./extra-caches.nix
     ./firmware-updates.nix
+    ./git.nix
     ./globalinstalls.nix
     ./gnome.nix
     ./intel-graphics.nix

nixosModules/git.nix

@@ -0,0 +1,24 @@
+{
+  lib,
+  config,
+  pkgs,
+  ...
+}:
+{
+  options.my.git.enable = lib.mkEnableOption "git with credential helper";
+
+  config = lib.mkIf config.my.git.enable {
+    environment.systemPackages = [ pkgs.git-credential-oauth ];
+
+    programs.git = {
+      enable = true;
+      config = {
+        init.defaultBranch = "main";
+        credential = {
+          helper = "oauth";
+          credentialStore = "cache";
+        };
+      };
+    };
+  };
+}

nixosModules/globalinstalls.nix

@@ -16,24 +16,16 @@
       screen
       tldr
       nix-output-monitor
-      git-credential-oauth
     ];
 
     programs = {
       zsh.enable = true;
       htop.enable = true;
       iotop.enable = true;
-      git.enable = true;
       nano = {
         enable = true;
         syntaxHighlight = true;
       };
     };
-
-    environment.etc."gitconfig".text = ''
-      [credential]
-        helper = oauth
-        credentialStore = cache
-    '';
   };
 }