fix: set correct default for runtime_platform variable to ensure idem…

…potence (#291)

README.md

@@ -384,7 +384,7 @@ allow_github_webhooks        = true
 | <a name="input_route53_private_zone"></a> [route53\_private\_zone](#input\_route53\_private\_zone) | Enable to use a private Route53 zone | `bool` | `false` | no |
 | <a name="input_route53_record_name"></a> [route53\_record\_name](#input\_route53\_record\_name) | Name of Route53 record to create ACM certificate in and main A-record. If null is specified, var.name is used instead. Provide empty string to point root domain name to ALB. | `string` | `null` | no |
 | <a name="input_route53_zone_name"></a> [route53\_zone\_name](#input\_route53\_zone\_name) | Route53 zone name to create ACM certificate in and main A-record, without trailing dot | `string` | `""` | no |
-| <a name="input_runtime_platform"></a> [runtime\_platform](#input\_runtime\_platform) | Configuration block for runtime\_platform that containers in your task may use. | `any` | `{}` | no |
+| <a name="input_runtime_platform"></a> [runtime\_platform](#input\_runtime\_platform) | Configuration block for runtime\_platform that containers in your task may use. | `any` | `null` | no |
 | <a name="input_security_group_ids"></a> [security\_group\_ids](#input\_security\_group\_ids) | List of one or more security groups to be added to the load balancer | `list(string)` | `[]` | no |
 | <a name="input_ssm_kms_key_arn"></a> [ssm\_kms\_key\_arn](#input\_ssm\_kms\_key\_arn) | ARN of KMS key to use for encryption and decryption of SSM Parameters. Required only if your key uses a custom KMS key and not the default key | `string` | `""` | no |
 | <a name="input_start_timeout"></a> [start\_timeout](#input\_start\_timeout) | Time duration (in seconds) to wait before giving up on resolving dependencies for a container | `number` | `30` | no |

variables.tf

@@ -716,5 +716,5 @@ variable "create_route53_aaaa_record" {
 variable "runtime_platform" {
   description = "Configuration block for runtime_platform that containers in your task may use."
   type        = any
-  default     = {}
+  default     = null
 }