Add data clean schedule (#1859)

Co-authored-by: jyong <jyong@dify.ai>

api/docker/entrypoint.sh

@@ -10,6 +10,8 @@ fi
 if [[ "${MODE}" == "worker" ]]; then
   celery -A app.celery worker -P ${CELERY_WORKER_CLASS:-gevent} -c ${CELERY_WORKER_AMOUNT:-1} --loglevel INFO \
     -Q ${CELERY_QUEUES:-dataset,generation,mail}
+elif [[ "${MODE}" == "beat" ]]; then
+  celery -A app.celery beat --loglevel INFO
 else
   if [[ "${DEBUG}" == "true" ]]; then
     flask run --host=${DIFY_BIND_ADDRESS:-0.0.0.0} --port=${DIFY_PORT:-5001} --debug