Suggestion: Add new outputs

[aoki-h-jp]

Hi, I often use your terraform module because it is very useful to make a layer!

Suggestion

I want to use the layers I created in a cross account, so I need to grant permissions on terraform as follows.

module "lambda_layer_requests" {
  source              = "git::https://github.com/enter-at/terraform-aws-lambda-layer.git?ref=main"
  layer_name          = "cmn-layer-python-requests"
  source_type         = "python"
  package_file        = "./modules/lambda_layer/requests/requirements.txt"
  compatible_runtimes = ["python3.8", "python3.9", "python3.10", "python3.11", "python3.12"]
}

resource "aws_lambda_layer_version_permission" "allow_cross_account_access_requests" {
  for_each = {
    "dev-XXX" = "123456789012",
    "stg-XXX" = "123456789012",
    "prd-XXX" = "123456789012"
  }

  layer_name     = module.lambda_layer_requests.layer_arn
  version_number = tonumber(split(":", module.lambda_layer_requests.arn)[length(split(":", module.lambda_layer_requests.arn)) - 1])
  statement_id   = "AllowCrossAccountAccess-requests-${each.key}"
  principal      = each.value
  action         = "lambda:GetLayerVersion"
}

I would like to make a suggestion about the version_number. This implementation can get the version_number, but I would like to avoid this implementation because it is like a hard-coded.

So, Can you implement on output.tf like this?

output "version_number" {
  value       = tonumber(split(":", aws_lambda_layer_version.main.arn)[length(split(":", aws_lambda_layer_version.main.arn)) - 1])
  description = "The Lamba layer version number."
}

I hope this module will be used by more developers!