Create an AWS CodePipeline pipeline that uses AWS CodeBuild. Create an AWS Lambda function to run the pipeline every month. Create an AWS CloudFormation template. Share the template with all AWS accounts in the organization.

Create an AMI pipeline by using EC2 Image Builder. Configure the pipeline to distribute the AMI to the AWS accounts in the organization. Configure the pipeline to run monthly.

Create an AWS CodePipeline pipeline that runs an AWS Lambda function to build the AMI. Configure the pipeline to share the AMI with the AWS accounts in the organization. Configure Amazon EventBridge Scheduler to invoke the pipeline every month.

Create an AWS Systems Manager Automation runbook. Configure the automation to run in all AWS accounts in the organization. Create an AWS Lambda function to run the automation every month.