Add name conventions to aws-genomics-s3 template

Update separate aws-genomics-s3 stack template with naming conventions

Author: illusional

src/templates/aws-genomics-s3.template.yaml

@@ -16,6 +16,13 @@ Mappings:
 Parameters:
   S3BucketName:
     Type: String
+    Description: >-
+      A S3 bucket name for storing analysis results.
+      The bucket name must respect the S3 bucket naming conventions 
+      (can contain lowercase letters, numbers, periods and hyphens).
+    Type: String
+    AllowedPattern: "(?=^.{3,63}$)(?!^(\\d+\\.)+\\d+$)(^(([a-z0-9]|[a-z0-9][a-z0-9\\-]*[a-z0-9])\\.)*([a-z0-9]|[a-z0-9][a-z0-9\\-]*[a-z0-9])$)"
+    ConstraintDescription: "Must respect AWS naming conventions"
   ExistingBucket:
     Type: String
     Description: Does this bucket already exist? If not, it will be created.