Add REUSE to CI

Ensures proper copyright for the repo

tests/layer/test_setting_util.cpp

@@ -1,23 +1,11 @@
-/*
- * Copyright (c) 2023-2023 Valve Corporation
- * Copyright (c) 2023-2023 LunarG, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * Authors:
- * - Christophe Riccio <christophe@lunarg.com>
- */
-
+// Copyright 2023 The Khronos Group Inc.
+// Copyright 2023 Valve Corporation
+// Copyright 2023 LunarG, Inc.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// Author(s):
+// - Christophe Riccio <christophe@lunarg.com>
 #include "layer_settings_util.hpp"
 
 #include <gtest/gtest.h>