Use variable component tag in the introspection mixin

[rusowyler]

Describe the Feature

Instead of a fixed value, set the component name tag using a variable.

Expected Behavior

By setting

component_tag="IacComponent" 

Obtain:

      + tags                  = {
          + "Iac"          = "Terraform"
          + "IacComponent" = "ecs-service"
          + "Stage"        = "dev"

Use Case

Some companies may have different patterns for the component name tag. By using this solution, they may change it.

Code suggestion

locals {
  # Throw an error if lookup fails
  check_required_tags = module.this.enabled ? [
    for k in var.required_tags :
    lookup(module.this.tags, k)
  ] : []
}

variable "required_tags" {
  type        = list(string)
  description = "List of required tag names"
  default     = []
}

variable "component_tag" {
  type        = string
  description = "The name of the tag that will be used to identify the component"
  default     = "IacComponent"
}

# `introspection` module will contain the additional tags
module "introspection" {
  source  = "cloudposse/label/null"
  version = "0.25.0"

  tags = merge(var.tags, {
    format("%s", var.component_tag) = basename(abspath(path.module))
  })

  context = module.this.context
}