feat: support setting throughput and iops for ebs volumes

[tibuntu]

Description

These changes will add support for setting throughput and iops to the EBS device that is being attached to the docker_machine instance. Because setting iops is now possible, this will also allow the usage of io1 and io2 EBS volumes types.

Migrations required

No - If you consider my defaults for the two new variables as sane.

Verification

I have adapted the module configuration by changing the runner_worker_docker_machine_instance input variables:

  runner_worker_docker_machine_instance = {
    private_address_only = false
    types                = ["m5.large", "t3.xlarge", "m6a.large"]
    subnet_ids           = [module.vpc.public_subnets[0]]
    runners_idle_time    = 180
    root_size            = 30
    volume_type          = "io2"
    volume_iops          = 6000
  }

The volume was created successfully when testing the runner via Gitlab:

[github-actions]

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[kayman-mk]

Thanks for your contribution, @tibuntu