fqdn needs RE . validation or derivation from route53 zone - as Cert/Route53 error only occurs during nested CF build

[obriensystems]

Describe the bug
fqdn needs validation or derivation from zone - as Cert/Route53 error only occurs during nested CF build
Once you select the domain - if you forget to add the FQDN after the prefix - a failure only occurs mid CF deploy
Fix is to append the domain name to the prefix or at least validate using RE that there is at least one . domain separator

working
orchestrator.packet.global
failing
orchestrator (no fqdn)

Product and Cloud
latest AWS template with VPC
https://aws-quickstart.github.io/quickstart-uipath-orchestrator/#_launch_the_quick_start

Expected behavior
template creates successfully

Additional context
missing out on adding .packet.global to the Hosting FQDN will result 
in an error later on that will require a partial manual rollback of the RDS instance.
RDS must be manually deleted before the stack can be deleted

2021-04-15 09:54:04 UTC-0400

OrchestratorStack

CREATE_FAILED

Embedded stack arn:aws:cloudformation:us-west-1:453279094200:stack/
UiPath-Orchestrator-OrchestratorStack-12EYHJTMLWPX9/03fc1270-9df2-11eb-a5bf-024d78a93fd5
was not successfully created: The following resource(s) failed to create:
[ConfigureSSLStack, FindAmiLambdaRole, StorageStack, DatabaseStack].

add validation and/or derivation to https://github.com/UiPath/Infrastructure/blob/main/AWS/Orchestrator/templates/main.template.yaml#L819

see also #110

[AndreiBarbuOz]

hi @obriensystems ,
this allowed pattern should fix the issue:

^(?!:\/\/)(?=.{1,255}$)((.{1,63}\.){1,127}(?![0-9]*$)[a-z0-9-]+\.?)$