works again, mostly done, now we can start with server

modules/system/git.nix

@@ -0,0 +1,28 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+{
+  config = {
+    programs = {
+      git = {
+        enable = true;
+        config = {
+          init = {
+            defaultBranch = "main";
+          };
+          user = {
+            email = "${config.user.email}";
+            name = "${config.user.userName}";
+          };
+          push = {
+            autoSetupRemote = true;
+          };
+        };
+      };
+    };
+  };
+}