如何在Terragrunt中用数组定义多依赖并通过列表推导式配置输入？

当前Terragrunt配置如下：

terraform {
  source = "${get_path_to_repo_root()}//modules/shared-infra"
}

dependency "project_1" {
  config_path = "../../../project_1"
}

dependency "project_2" {
  config_path = "../../../project_2"
}


inputs {
   shared_vpc_service_project_ids = [
      dependency.project_1.outputs.project_id,
      dependency.project_2.outputs.project_id
   ]

   shared_vpc_host_subnet_users = [
      "serviceAccount:${dependency.project_1.outputs.sa_email}",
      "serviceAccount:${dependency.project_2.outputs.sa_email}",
   ]
   
   < ... more variables ... >
}

想知道是否可以将依赖定义在数组中，通过列表推导式配置inputs，从而实现新增项目时无需逐个更新每一项输入配置，类似如下写法：

locals {
   projects = [dependency.project_1, dependency.project_2]
}

inputs {
   shared_vpc_service_project_ids = [ for p in projects : p.outputs.project_id ]

   shared_vpc_host_subnet_users = [ for p in projects : "serviceAccount:${p.outputs.sa_email}" ]
   
   < ... more variables ... >
}

完全可以这么做，这种写法在Terragrunt中是合法且实用的，能有效减少重复配置，大幅提升维护效率。

优化后的完整配置如下：

terraform {
  source = "${get_path_to_repo_root()}//modules/shared-infra"
}

# 定义所有项目依赖
dependency "project_1" {
  config_path = "../../../project_1"
}

dependency "project_2" {
  config_path = "../../../project_2"
}

# 用locals统一管理依赖引用集合
locals {
  projects = [dependency.project_1, dependency.project_2]
}

inputs {
  shared_vpc_service_project_ids = [for p in local.projects : p.outputs.project_id]
  shared_vpc_host_subnet_users = [for p in local.projects : "serviceAccount:${p.outputs.sa_email}"]
  
  < ... more variables ... >
}

后续新增项目时，仅需两步操作：

1. 添加对应的dependency块，比如dependency "project_3" { config_path = "../../../project_3" }
2. 在local.projects数组中新增该依赖项，即projects = [dependency.project_1, dependency.project_2, dependency.project_3]

所有关联的输入配置会自动通过列表推导式生成，无需手动逐个修改inputs下的每一项。

内容的提问来源于stack exchange，提问作者Martynas Jurkus