pub fn sign_directory_manifest(
manifest: &mut DirectoryUpdateManifest,
private_key: &str,
signature_key_id: Option<String>,
) -> Result<ManifestSignature>pub fn sign_directory_manifest(
manifest: &mut DirectoryUpdateManifest,
private_key: &str,
signature_key_id: Option<String>,
) -> Result<ManifestSignature>