ECS_ENABLE_SPOT_INSTANCE_DRAINING should be enabled with one condition

[jakubserwatka-oktawave]

Describe the Bug

In line

echo ECS_ENABLE_SPOT_INSTANCE_DRAINING=${provider.instance_market_options != null && provider.mixed_instances_policy != null} >> /etc/ecs/ecs.config

The spot instance draining is only enabled if both instance_market_options and mixed_instances_policy are set.
However, spot instances will be created if only mixed_instances_policy is set.

Didn't test it with only instance_market_options but I suspect it will also be enough for spot instance to be created

Expected Behavior

ECS_ENABLE_SPOT_INSTANCE_DRAINING=true when using only instance_market_options

Steps to Reproduce

    container_insights_enabled      = false
    capacity_providers_fargate      = false
    capacity_providers_fargate_spot = false

    capacity_providers_ec2 = {
        "arm-spot" = {
            image_id = "ami-04e33f2552051ccaa"

            instance_type = "t4g.small"
            mixed_instances_policy = {
                instances_distribution = {
                    on_demand_allocation_strategy            = "prioritized"
                    on_demand_base_capacity                  = 0
                    on_demand_percentage_above_base_capacity = 0
                    spot_allocation_strategy                 = "price-capacity-optimized"
                    spot_instance_pools                      = 0
                    spot_max_price                           = ""
                }
            }

            max_size = 3
            min_size = 1
            target_capacity_utilization = 80

            subnet_ids    = [
                ...
            ]
            security_group_ids = [
                ...
            ]
            associate_public_ip_address = true

            enable_monitoring = false
        }
    }

Screenshots

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Environment

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Additional Context

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