The production UNIVAF service at getmyvax.org was shut down on June 15, 2023. The remaining configuration code here supports historical archives and a shutdown notice page. If you are planning to deploy your own copy of UNIVAF to AWS, you can use the former production Terraform code in the ./deprecated folder as guide.
Whenever these files are changed, Terraform Cloud (a Terraform as a service offering) will pick up on it and develop a plan for what needs to actually change in AWS and, if the commit is on the main branch, automatically apply those changes.
For more on Terraform configuration files, check out the reference docs.