Find the documentation here: https://templates.cloudonaut.io/en/stable/jenkins/
To update the region map execute the following lines in your terminal:
for region in $(aws ec2 describe-regions --query 'Regions[].RegionName' --output text); do ami=$(aws --region $region ssm get-parameter --name /aws/service/ami-amazon-linux-latest/amzn2-ami-hvm-x86_64-gp2 --query Parameter.Value --output text); printf "'$region':\n AMI: '$ami'\n"; done