Implement the auto scaling for Fargate cluster

[longnd]

Why

Currently, we don't have auto-scaling for the Fargate cluster, each service runs with a fixed amount of tasks. It is not sufficient for the production environment.

Thus, we need to implement the auto-scaling for the Fargate clusters so it can scale up & down according to the pre-defined rules.

Who Benefits?

• The clients who own the application
• The development squad that need to manage the infrastructure.

[hoangmirs]

This is duplicated with https://github.com/nimblehq/infrastructure-templates/issues/137

[longnd]

I didn't realize that. Closed. Thank you 🙏.