Fix gunicorn worker timeout on large file uploads by switching to gevent async workers

entrypoint.sh

@@ -5,4 +5,4 @@ python manage.py collectstatic --noinput
 python manage.py migrate --noinput
 python manage.py loaddata initial
 python manage.py create_default_admin
-exec gunicorn photo21.wsgi:application --bind 0.0.0.0:8000 --workers 3
+exec gunicorn photo21.wsgi:application --bind 0.0.0.0:8000 --workers 3 --worker-class gevent

requirements.txt

@@ -10,4 +10,5 @@ whitenoise>=6.0
 psycopg2-binary>=2.9
 requests>=2.25
 gunicorn>=21.0
+gevent>=23.9
 av>=12.0