fix(nix/tests): Add git to Nix's rust build/test sandbox

The integration test `reset_single_exercise` depends on Git...

Author: x10an14

flake.nix

@@ -25,6 +25,7 @@
             version = "5.5.1";
 
             buildInputs = cargoBuildInputs;
+            nativeBuildInputs = [pkgs.git];
 
             src = with pkgs.lib; cleanSourceWith {
               src = self;