It’s more realistic to have the Rails sample app with Postgres instead of MySQL. Is there a way to fork the could provided so I could share a version that uses Postgres for the sample app?
Yes, fork cfn-modules/rds-aurora-serverless to do so. However, it should be easy for us to add PostgreSQL to our module. So let me put that on my TODO list for this week.
You can replace the rds-aurora-serverless module with https://github.com/cfn-modules/rds-aurora-serverless-postgres and you are good to go