Function foreach

src/oci/spec.cpp:54–60

  }

  foreach (const ManifestDescriptor& manifest, index.manifests()) {
    Option<Error> error = validateDigest(manifest.digest());
    if (error.isSome()) {
      return Error(
          "Failed to validate 'digest' of the 'manifest': " + error->message);
    }
  }

  return None();
}