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per <https://cloud.google.com/cdn/docs/using-signed-urls#configuring_google_cloud_storage_permissions>

tried
```const storageIam = new gcp.projects.IAMMember("cdnStorageIam", {
    member: `serviceAccount:service-${config.require("projectNumber")}@cloud-cdn-fill.iam.gserviceaccount.com`,
    project: gcpConfig.require("project"),
    role: "roles/storage.viewer",
});```


getting `googleapi: Error 400: Role roles/storage.viewer is not supported for this resource., badRequest`