feat: add support for deployment_circuit_breaker configuration

This change adds support for the ECS deployment circuit breaker feature,
which allows for automatic rollback of failed deployments.

The deployment_circuit_breaker configuration is now passed through from
the service variable to the underlying ECS service module, enabling users
to configure automatic rollback behavior for their Atlantis deployments.

Example usage:
  service = {
    deployment_circuit_breaker = {
      enable   = true
      rollback = true
    }
  }

Updated both example configurations (github-complete and github-separate)
to demonstrate the circuit breaker feature.

Tested locally by referencing the module and confirming the circuit
breaker configuration is properly applied to the ECS service.

Author: willaustin

README.md

@@ -200,6 +200,26 @@ module "atlantis" {
 }
 ```
 
+### Enable Deployment Circuit Breaker
+
+You can enable the ECS deployment circuit breaker to automatically roll back failed deployments:
+
+```hcl
+module "atlantis" {
+  source  = "terraform-aws-modules/atlantis/aws"
+
+  # ...
+
+  service = {
+    # Enable circuit breaker for automatic rollback on failed deployments
+    deployment_circuit_breaker = {
+      enable   = true
+      rollback = true
+    }
+  }
+}
+```
+
 ## Examples
 
 - [Complete Atlantis with GitHub webhook](https://github.com/terraform-aws-modules/terraform-aws-atlantis/tree/master/examples/github-complete)

examples/github-complete/main.tf

@@ -70,6 +70,12 @@ module "atlantis" {
     tasks_iam_role_policies = {
       AdministratorAccess = "arn:aws:iam::aws:policy/AdministratorAccess"
     }
+
+    # Enable circuit breaker for automatic rollback on failed deployments
+    deployment_circuit_breaker = {
+      enable   = true
+      rollback = true
+    }
   }
 
   # ALB

main.tf

@@ -235,6 +235,7 @@ module "ecs_service" {
   alarms                             = try(var.service.alarms, {})
   capacity_provider_strategy         = try(var.service.capacity_provider_strategy, {})
   cluster_arn                        = var.create_cluster && var.create ? module.ecs_cluster.arn : var.cluster_arn
+  deployment_circuit_breaker         = try(var.service.deployment_circuit_breaker, {})
   deployment_controller              = try(var.service.deployment_controller, {})
   deployment_maximum_percent         = try(var.service.deployment_maximum_percent, local.deployment_maximum_percent)
   deployment_minimum_healthy_percent = try(var.service.deployment_minimum_healthy_percent, local.deployment_minimum_healthy_percent)