feat: add license

Signed-off-by: hlts2 <hiroto.funakoshi.hiroto@gmail.com>

.github/workflows/update-actions.yaml

@@ -1,3 +1,18 @@
+#
+# Copyright (C) 2019-2024 vdaas.org vald team <vald@vdaas.org>
+#
+# 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
+#
+#    https://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.
+#
 name: Update Actions version
 on:
   workflow_dispatch: