playground/terraform/infrastructure/setup/iam.tf

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resource "google_service_account" "playground_service_account" {
  account_id   = var.service_account_id
  display_name = var.service_account_id
}

resource "google_service_account" "playground_service_account_cf" {
  account_id   = "${google_service_account.playground_service_account.account_id}-cf"
  display_name = "${google_service_account.playground_service_account.account_id}-cf"
}

resource "google_project_iam_member" "terraform_service_account_roles" {
  for_each = toset([
     "roles/container.nodeServiceAccount", "roles/datastore.viewer", "roles/artifactregistry.reader", "roles/logging.logWriter", "roles/monitoring.metricWriter", "roles/stackdriver.resourceMetadata.writer", "roles/bigquery.readSessionUser", "roles/bigquery.dataViewer", "roles/bigquery.jobUser", 
  ])
  role    = each.value
  member  = "serviceAccount:${google_service_account.playground_service_account.email}"
  project = var.project_id
}

resource "google_project_iam_member" "cloudfunction" {
   for_each = toset([
     "roles/storage.objectViewer","roles/cloudfunctions.invoker","roles/datastore.user",
   ])
   role    = each.key
   member  = "serviceAccount:${google_service_account.playground_service_account_cf.email}"
   project = var.project_id
}