Add missing license headers for the bash scripts

build.sh

diff --git a/build.sh b/build.sh
index 9128700..0fefb4a 100755
--- a/build.sh
+++ b/build.sh
@@ -1,4 +1,17 @@
 #!/bin/bash
+# Copyright 2023 Google LLC
+#
+# 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.
 
 # Fail on any error
 set -e

kokoro/gcp_ubuntu_docker/kokoro_build.sh

diff --git a/kokoro/gcp_ubuntu_docker/kokoro_build.sh b/kokoro/gcp_ubuntu_docker/kokoro_build.sh
index f46e31a..4d888cf 100755
--- a/kokoro/gcp_ubuntu_docker/kokoro_build.sh
+++ b/kokoro/gcp_ubuntu_docker/kokoro_build.sh
@@ -1,4 +1,17 @@
 #!/bin/bash
+# Copyright 2023 Google LLC
+#
+# 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.
 
 # Fail on any error
 set -e