Old script ran into problems if environment was set to "auto update" for bug fixes and patches. Elastic Beanstalk would spin up a new server, and try to validate a new SSL install before deploying which would fail. To prevent this from happening, the script now uploads SSL certificates to the same S3 repo that Elastic Beanstalk uses for application versioning.
On deploy, the script checks to see if an SSL certificate is stored on S3 before anything else.