Function ingest_host_output 

async fn ingest_host_output<BS, DS>(
    idx: usize,
    host_output_path: &Path,
    scanner: ReferenceScanner<String>,
    blob_service: BS,
    directory_service: DS,
) -> Result<BuildUpdate, IngestionError<Error>>
where
    BS: BlobService,
    DS: DirectoryService,

Ingests the given host output path, while running reference scanning. Returns either a BuildUpdate::ProducedOutput, or a BuildFailure