Add cache locks

src/core/setup_arq.py

@@ -1,9 +1,12 @@
+import aioredis
+
 from app.services.cache_updater import (
     check_books,
     cache_file_by_book_id,
     check_books_page,
 )
 from core.arq_pool import get_redis_settings, get_arq_pool
+from core.config import env_config
 from core.db import database
 import core.sentry  # noqa: F401
 
@@ -13,6 +16,9 @@ async def startup(ctx):
         await database.connect()
 
     ctx["arc_pool"] = await get_arq_pool()
+    ctx["redis"] = aioredis.Redis(
+        host=env_config.REDIS_HOST, port=env_config.REDIS_PORT, db=env_config.REDIS_DB
+    )
 
 
 async def shutdown(ctx):