Enable CI tests for this repo

[joeduffy]

No description provided.

[lukehoban]

From @mmdriley:

e.g.

let instanceProfile = new aws.iam.InstanceProfile("ecsClusterInstanceProfile", {
roles: [ instanceRole ],
});
Caused by hashicorp/terraform-provider-aws#1777.

We can probably fix this in the Terraform AWS provider, but if we hit this often enough we may need to think about invoking the provider's "Refresh" logic so we're not fighting against the provider's assumptions based on how it's used from Terraform.