V6.15.0 cloudformation template incomplete

See: v6.15.0 is missing AWSRegion2AMI mappings for all regions except us-east-1 · Issue #1289 · buildkite/elastic-ci-stack-for-aws · GitHub

Seems like a regression (see comments) to an issue last seen in 2020.

Hello, @jufemaiz!
Thank you for pointing this out. We are already working on solving the issue.

Best!
Karen