Add additional git configuration

home-manager/base.nix

@@ -4,6 +4,7 @@
   imports = [
     ./programs/vim.nix
     ./programs/gpg.nix
+    ./programs/git.nix
   ];
 
   # Self-hosting

home-manager/programs/git.nix

@@ -0,0 +1,20 @@
+{ pkgs, ... }: {
+  home.packages = with pkgs; [
+    git-credential-manager
+  ];
+
+  programs.git = {
+    enable = true;
+    package = pkgs.gitFull;
+    extraConfig.init.defaultBranch = "main";
+
+    extraConfig.credential = {
+      helper = "store";
+      credentialStore = "store";
+    };
+
+    aliases = {
+      tree = "log --oneline --decorate --all --graph";
+    };
+  };
+}