Add RegEx to ensure Project Name is valid for S3 bucket 

Can somebody please clean up the CloudFormation in this file:

https://github.com/ModusCreateOrg/capsule/blob/master/ci/s3_cloudformation.cf

We need a RegEx adding to ensure the project name is valid for use in an S3 bucket. Currently, there is no validation on the name as per the description:

` Description: "Name of the project. TODO: Add validation regex"` 

