fix: handle enable_on_demand_failover_for_errors default value

Author: pwo3

modules/runners/main.tf

@@ -211,7 +211,7 @@ resource "aws_launch_template" "runner" {
   # Additionally, tagging spot requests via the CreateFleetCommand in the Lambda function does not work as expected,
   # so we rely on Terraform to manage these tags only when spot is exclusively used without on-demand failover.
   dynamic "tag_specifications" {
-    for_each = var.instance_target_capacity_type == "spot" && var.enable_on_demand_failover_for_errors == null ? [1] : [] # Include the block only if the value is "spot" and on_demand_failover_for_errors is not enabled
+    for_each = var.instance_target_capacity_type == "spot" && length(var.enable_on_demand_failover_for_errors) == 0 ? [1] : [] # Include the block only if the value is "spot" and on_demand_failover_for_errors is not enabled
     content {
       resource_type = "spot-instances-request"
       tags = merge(