Add module.cache.policy_arn to outputs for other gitlab runner module to reference

[houdinisparks]

Describe the solution you'd like

I have multiple runners deployed, in a docker-machine runner - multiple runner agents architecture.
I want to re-use the cache bucket (of a runner) created, with other runners, but currently there's no easy way yet to reference the docker-machine policy arn created within the module.cache child module.

Describe alternatives you've considered

Suggest a solution

Proposing to

1. Add module.cache.policy_arn as an output to outputs.tf file, i.e

output "runner_cache_bucket_users_policy_arn" {
  description = "ARN of the policy for users of the cache (bucket)."
  value       = length(module.cache) > 0 ? module.cache[0].policy_arn : null
}

Additional context

[kayman-mk]

Could you please give some more details? I use the same setup but have no need for that. Creating the cache separately should solve this problem, doesn't it?

module "cache" {
  source  = "cattle-ops/gitlab-runner/aws//modules/cache"
  version = "6.5.1"
  # ... other options left out for readability
}

module "gitlab_runner_1" {
  for_each = data.aws_subnet.runners

  source  = "cattle-ops/gitlab-runner/aws"
  version = "6.5.1"

  cache_shared = true

  cache_bucket = {
    create = false
    policy = "${module.cache.policy_arn}"
    bucket = "${module.cache.bucket}"
  }

  # ... other options left out for readability
}

module "gitlab_runner_2" {
  for_each = data.aws_subnet.runners

  source  = "cattle-ops/gitlab-runner/aws"
  version = "6.5.1"

  cache_shared = true

  cache_bucket = {
    create = false
    policy = "${module.cache.policy_arn}"
    bucket = "${module.cache.bucket}"
  }

  # ... other options left out for readability
}

[kayman-mk]

@houdinisparks Have you had the time to check this?

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