modules: services: paperless: beef-up workers

This should parallelize the number of documents ingested at once
(workers), as well as the speed of the ingestion per document (threads).

modules/services/paperless/default.nix

@@ -73,6 +73,10 @@ in
           # OCR settings
           PAPERLESS_OCR_LANGUAGE = "fra+eng";
 
+          # Workers
+          PAPERLESS_TASK_WORKERS = 3;
+          PAPERLESS_THREADS_PER_WORKER = 4;
+
           # Misc
           PAPERLESS_TIME_ZONE = config.time.timeZone;
           PAPERLESS_ADMIN_USER = cfg.username;