[wip] use data source for org name in prow-build tf

infra/gcp/clusters/projects/k8s-infra-prow-build/prow-build/main.tf

@@ -33,6 +33,10 @@ locals {
   boskos_janitor_sa_name       = "boskos-janitor"       // Name of the GSA and KSA used by boskos-janitor
 }
 
+data "google_organization" "org" {
+  domain = "kubernetes.io"
+}
+
 module "project" {
   source = "../../../modules/gke-project"
   project_id            = local.project_id
@@ -49,8 +53,7 @@ resource "google_project_iam_member" "k8s_infra_prow_oncall" {
 // Ensure [email protected] has prow.viewer access to this project
 resource "google_project_iam_member" "k8s_infra_prow_viewers" {
   project = local.project_id
-  # TODO: use data resource to get org role name instead of hardcode
-  role    = "organizations/758905017065/roles/prow.viewer"
+  role    = "${data.org.name}/roles/prow.viewer"
   member  = "group:[email protected]"
 }