updated SPDX identifiers to CC-BY-4.0

Signed-off-by: Rahul Jadhav <nyrahul@gmail.com>

.spellcheck.yml

@@ -1,11 +1,13 @@
 ---
-# SPDX-license-identifier: Apache-2.0
+# SPDX-license-identifier: CC-BY-4.0
 ##############################################################################
-# Copyright (c) 2023 The Nephio Authors.
-# All rights reserved. This program and the accompanying materials
-# are made available under the terms of the Apache License, Version 2.0
-# which accompanies this distribution, and is available at
-# http://www.apache.org/licenses/LICENSE-2.0
+# Copyright (c) 2024 by The Nephio Authors
+#
+# This program and the accompanying materials is licensed under a
+# Creative Commons Attribution 4.0 International License.
+#
+# You should have received a copy of the license along with this
+# work. If not, see <https://creativecommons.org/licenses/by/4.0/>.
 ##############################################################################
 
 matrix:

Makefile

@@ -1,10 +1,12 @@
-# SPDX-license-identifier: Apache-2.0
+# SPDX-license-identifier: CC-BY-4.0
 ##############################################################################
-# Copyright (c) 2023 The Nephio Authors.
-# All rights reserved. This program and the accompanying materials
-# are made available under the terms of the Apache License, Version 2.0
-# which accompanies this distribution, and is available at
-# http://www.apache.org/licenses/LICENSE-2.0
+# Copyright (c) 2024 by The Nephio Authors
+#
+# This program and the accompanying materials is licensed under a
+# Creative Commons Attribution 4.0 International License.
+#
+# You should have received a copy of the license along with this
+# work. If not, see <https://creativecommons.org/licenses/by/4.0/>.
 ##############################################################################
 
 DOCKER_CMD ?= $(shell which docker 2> /dev/null || which podman 2> /dev/null || echo docker)