Ccl 1814 (#14)

* add further variablisation into resource names, to prevent duplication when module is run in a for loop

* updates resource to included required tags

* define variables within tenant_vars object

* experiment with non-nullable variables

* change set to list

variables.tf

@@ -10,7 +10,7 @@ variable "tenant_vars" {
     # other attributes, required for cloudfront creation
     repository                      = string
     github_environment_name         = string
-    cloudfront_aliases              = set
+    cloudfront_aliases              = list
     cloudfront_cert                 = string
     cloudfront_function_rewrite_arn = string