🏷️ Add mypy to the GitHub Action for tests and fixed types in the whole project (#655)

Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>

backend/app/worker.py

@@ -3,7 +3,7 @@ import sentry_sdk
 from app.core.celery_app import celery_app
 from app.core.config import settings
 
-sentry_sdk.init(dsn=settings.SENTRY_DSN)
+sentry_sdk.init(dsn=str(settings.SENTRY_DSN))
 
 
 @celery_app.task(acks_late=True)