🔧(backend) refine Celery retry policy to HTTP errors only

Only retry jobs on HTTP errors (docs push failures) rather than all
errors. Skip retries for Whisper processing failures as they won't
succeed on retry.

src/summary/summary/core/celery_worker.py

@@ -12,7 +12,7 @@ from celery import Celery, signals
 from celery.utils.log import get_task_logger
 from minio import Minio
 from mutagen import File
-from requests import Session
+from requests import Session, exceptions
 from requests.adapters import HTTPAdapter
 from urllib3.util import Retry
 
@@ -221,7 +221,11 @@ def process_audio_transcribe_summarize(filename: str, email: str, sub: str):
     logger.debug("Response body: %s", response.text)
 
 
-@celery.task(bind=True, max_retries=settings.celery_max_retries)
+@celery.task(
+    bind=True,
+    autoretry_for=[exceptions.HTTPError],
+    max_retries=settings.celery_max_retries,
+)
 def process_audio_transcribe_summarize_v2(
     self, filename: str, email: str, sub: str, received_at: float
 ):