Allow customisable cron expression for bastion scale up/down schedules (

#276)

* Variable for scale cron expressions

* terraform-docs: automated action

* change to using one var with keys

* terraform-docs: automated action

* Update variables.tf

* terraform-docs: automated action

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

README.md

@@ -155,6 +155,7 @@ In order to prevent older versions from being retained forever, in addition to t
 |------|-------------|------|---------|:--------:|
 | <a name="input_allow_ssh_commands"></a> [allow\_ssh\_commands](#input\_allow\_ssh\_commands) | Allow SSH commands to be specified | `bool` | n/a | yes |
 | <a name="input_app_name"></a> [app\_name](#input\_app\_name) | Name of application | `string` | n/a | yes |
+| <a name="input_autoscaling_cron"></a> [autoscaling\_cron](#input\_autoscaling\_cron) | Cron expressions for scale up and scale down | `map(string)` | <pre>{<br>  "down": "0 20 * * *",<br>  "up": "0 5 * * *"<br>}</pre> | no |
 | <a name="input_bucket_force_destroy"></a> [bucket\_force\_destroy](#input\_bucket\_force\_destroy) | The bucket and all objects should be destroyed when using true | `bool` | n/a | yes |
 | <a name="input_bucket_name"></a> [bucket\_name](#input\_bucket\_name) | Bucket used for bucket log storage and user public keys | `string` | n/a | yes |
 | <a name="input_bucket_versioning"></a> [bucket\_versioning](#input\_bucket\_versioning) | Enable bucket versioning or not | `bool` | n/a | yes |

main.tf

@@ -491,7 +491,7 @@ resource "aws_autoscaling_schedule" "bastion_linux_scale_down" {
   min_size               = 0
   max_size               = 0
   desired_capacity       = 0
-  recurrence             = "0 20 * * *" # 20.00 UTC time or 21.00 London time
+  recurrence             = var.autoscaling_cron["up"]
   autoscaling_group_name = aws_autoscaling_group.bastion_linux_daily.name
 }
 
@@ -500,6 +500,6 @@ resource "aws_autoscaling_schedule" "bastion_linux_scale_up" {
   min_size               = 1
   max_size               = 1
   desired_capacity       = 1
-  recurrence             = "0 5 * * *" # 5.00 UTC time or 6.00 London time
+  recurrence             = var.autoscaling_cron["down"]
   autoscaling_group_name = aws_autoscaling_group.bastion_linux_daily.name
 }

variables.tf

@@ -112,3 +112,11 @@ variable "tags_prefix" {
   description = "prefix for name tags"
   type        = string
 }
+variable "autoscaling_cron" {
+  description = "Cron expressions for scale up and scale down"
+  type        = map(string)
+  default = {
+    "up"   = "0 5 * * *"  # 5.00 UTC or 6.00 BST
+    "down" = "0 20 * * *" # 20.00 UTC or 21.00 BST
+  }
+}