Block attempts to create a duplicate room name

Closes #103

app/Http/Controllers/Admin/RoomController.php

@@ -9,6 +9,7 @@ use App\Models\Room;
 use App\Models\User;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Auth;
+use Illuminate\Validation\Rule;
 
 use function redirect;
 
@@ -91,7 +92,7 @@ class RoomController extends Controller
             abort(403);
         }
         $validData = $request->validate([
-            'name' => 'required',
+            'name' => 'required|unique:rooms,name',
             'description' => 'nullable',
         ]);
 
@@ -109,7 +110,7 @@ class RoomController extends Controller
             abort(403);
         }
         $validData = $request->validate([
-            'name' => 'required',
+            'name' => ['required', Rule::unique('rooms', 'name')->ignore($room->id)],
             'description' => 'nullable',
         ]);