add license header

Author: sebsto

scripts/extract_aws_credentials.sh

@@ -1,4 +1,17 @@
 #!/bin/bash
+##===----------------------------------------------------------------------===##
+##
+## This source file is part of the SwiftAWSLambdaRuntime open source project
+##
+## Copyright (c) 2025 Apple Inc. and the SwiftAWSLambdaRuntime project authors
+## Licensed under Apache License v2.0
+##
+## See LICENSE.txt for license information
+## See CONTRIBUTORS.txt for the list of SwiftAWSLambdaRuntime project authors
+##
+## SPDX-License-Identifier: Apache-2.0
+##
+##===----------------------------------------------------------------------===##
 
 # Extract AWS credentials from ~/.aws/credentials and ~/.aws/config (default profile)
 # and set environment variables