Add a OpenStack based CFn template

@yas, The CFn template is ready for review. This template does the following

1. It merges all the nested templates into one template. This way, we don't have to host any nested templates in S3
2. This template does not ask the user for a Drupal password. Instead, a welcome email is sent when the user is created. The user can click on the link to login and update their password. Often times, this email gets stuck in the spam folder. Please check there for it.
3. The RDS password is randomly generated. There is no need to ask for it during launch.
4. The template points to a newer Dockerfile, which runs PHP 8.1 and also sets up mail utilities for sending site emails.

The template points to a test version of the Dockerfile located here: https://github.com/baldwinlouie/php-docker/blob/main/Dockerfile . Once this issue is committed: https://www.drupal.org/project/facade/issues/3344070 📌 Add a Dockerfile for OpenStack CFn template Fixed , I will update the default Dockerfile location.

@baldwinlouie

Thank you for the patch. I'll merge the patch to 5.x, and close this issue as Fixed.

Automatically closed - issue fixed for 2 weeks with no activity.