feat: allow setting container memory & cpu from task memory & cpu

fixes #168

Author: marcoceppi

README.md

@@ -222,6 +222,8 @@ allow_github_webhooks        = true
 | cloudwatch\_log\_retention\_in\_days | Retention period of Atlantis CloudWatch logs | `number` | `7` | no |
 | command | The command that is passed to the container | `list(string)` | `null` | no |
 | container\_depends\_on | The dependencies defined for container startup and shutdown. A container can contain multiple dependencies. When a dependency is defined for container startup, for container shutdown it is reversed. The condition can be one of START, COMPLETE, SUCCESS or HEALTHY | <pre>list(object({<br>    containerName = string<br>    condition     = string<br>  }))</pre> | `null` | no |
+| container\_cpu | The number of cpu units used by the atlantis container. If not specified ecs\_task\_cpu will be used | `number` | `null` | no |
+| container\_memory | The amount (in MiB) of memory used by the atlantis container. If not specified ecs\_task\_memory will be used | `number` | `null` | no |
 | container\_memory\_reservation | The amount of memory (in MiB) to reserve for the container | `number` | `128` | no |
 | create\_route53\_record | Whether to create Route53 record for Atlantis | `bool` | `true` | no |
 | custom\_container\_definitions | A list of valid container definitions provided as a single valid JSON document. By default, the standard container definition is used. | `string` | `""` | no |

main.tf

@@ -448,8 +448,8 @@ module "container_definition_github_gitlab" {
   container_name  = var.name
   container_image = local.atlantis_image
 
-  container_cpu                = var.ecs_task_cpu
-  container_memory             = var.ecs_task_memory
+  container_cpu                = var.container_cpu != null ? var.container_cpu : var.ecs_task_cpu
+  container_memory             = var.container_memory != null ? var.container_memory : var.ecs_task_memory
   container_memory_reservation = var.container_memory_reservation
 
   user                     = var.user
@@ -505,8 +505,8 @@ module "container_definition_bitbucket" {
   container_name  = var.name
   container_image = local.atlantis_image
 
-  container_cpu                = var.ecs_task_cpu
-  container_memory             = var.ecs_task_memory
+  container_cpu                = var.container_cpu != null ? var.container_cpu : var.ecs_task_cpu
+  container_memory             = var.container_memory != null ? var.container_memory : var.ecs_task_memory
   container_memory_reservation = var.container_memory_reservation
 
   user                     = var.user

variables.tf

@@ -281,6 +281,18 @@ variable "ecs_task_memory" {
   default     = 512
 }
 
+variable "container_cpu" {
+  description = "The number of cpu units used by the atlantis container. If not specified ecs\_task\_cpu will be used"
+  type        = number
+  default     = null
+}
+
+variable "container_memory" {
+  description = "The amount (in MiB) of memory used by the atlantis container. If not specified ecs\_task\_memory will be used"
+  type        = number
+  default     = null
+}
+
 variable "container_memory_reservation" {
   description = "The amount of memory (in MiB) to reserve for the container"
   type        = number