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A company has a CI/CD pipeline built in AWS CodePipeline for deployment updates. Part of the deployment process is to perform database schema updates and is performed via AWS CodeBuild. A recent security audit has discovered that the AWS CodeBuild is downloading the database scripts via Amazon S3 in an unauthenticated manner. The security team requires a solution that will enhance the security of the company's CI/CD pipeline. What action should the DevOps Engineer take to address the issue in the MOST secure way?