feat: add autoscaler runner instance ready command option

main.tf

@@ -131,6 +131,8 @@ locals {
       runners_update_interval                = var.runner_worker_docker_autoscaler.update_interval
       runners_update_interval_when_expecting = var.runner_worker_docker_autoscaler.update_interval_when_expecting
 
+      runners_instance_ready_command = var.runner_worker_docker_autoscaler.instance_ready_command
+
       runners_autoscaling = [for config in var.runner_worker_docker_autoscaler_autoscaling_options : {
         for key, value in config :
         # Convert key from snake_case to PascalCase which is the casing for this section.

template/runner-docker-autoscaler-config.tftpl

@@ -9,6 +9,8 @@
     max_use_count = ${runners_max_use_count}
     max_instances = ${runners_max_instances}
 
+    instance_ready_command="${runners_instance_ready_command}"
+
     [runners.autoscaler.plugin_config] # plugin specific configuration (see plugin documentation)
       name = "${docker_autoscaling_name}"     # AWS Autoscaling Group name
 

variables.tf

@@ -610,6 +610,7 @@ variable "runner_worker_docker_autoscaler" {
     max_use_count = Max job number that can run on a worker
     update_interval = The interval to check with the fleeting plugin for instance updates.
     update_interval_when_expecting = The interval to check with the fleeting plugin for instance updates when expecting a state change.
+    instance_ready_command = Executes this command on each instance provisioned by the autoscaler to ensure that it is ready for use. A failure results in the instance being removed.
   EOT
   type = object({
     fleeting_plugin_version        = optional(string, "1.0.0")
@@ -619,6 +620,7 @@ variable "runner_worker_docker_autoscaler" {
     max_use_count                  = optional(number, 100)
     update_interval                = optional(string, "1m")
     update_interval_when_expecting = optional(string, "2s")
+    instance_ready_command         = optional(string, "")
   })
   default = {}
 }