Limit worker lifespan - RAM useage mitigation (#644)

Limit worker lifespan to save our precious RAM as discussed on [Discord](https://discord.com/channels/920056098122248193/1179480913701241002/1180026088802496512)

Mitigates #500 though RAM usage can still ramp rather high before worker is culled

docker_assets/run.sh

@@ -18,7 +18,7 @@ python manage.py ta_migpath
 
 # start all tasks
 nginx &
-celery -A home.tasks worker --loglevel=INFO &
+celery -A home.tasks worker --loglevel=INFO --max-tasks-per-child 10 &
 celery -A home beat --loglevel=INFO \
     -s "${BEAT_SCHEDULE_PATH:-${cachedir}/celerybeat-schedule}" &
 uwsgi --ini uwsgi.ini