fix: kill signal is not passed to the main process (#6159)

api/docker/entrypoint.sh

 fi
 
 if [[ "${MODE}" == "worker" ]]; then
-  celery -A app.celery worker -P ${CELERY_WORKER_CLASS:-gevent} -c ${CELERY_WORKER_AMOUNT:-1} --loglevel INFO \
+  exec celery -A app.celery worker -P ${CELERY_WORKER_CLASS:-gevent} -c ${CELERY_WORKER_AMOUNT:-1} --loglevel INFO \
     -Q ${CELERY_QUEUES:-dataset,generation,mail,ops_trace,app_deletion}
 elif [[ "${MODE}" == "beat" ]]; then
-  celery -A app.celery beat --loglevel INFO
+  exec celery -A app.celery beat --loglevel INFO
 else
   if [[ "${DEBUG}" == "true" ]]; then
-    flask run --host=${DIFY_BIND_ADDRESS:-0.0.0.0} --port=${DIFY_PORT:-5001} --debug
+    exec flask run --host=${DIFY_BIND_ADDRESS:-0.0.0.0} --port=${DIFY_PORT:-5001} --debug
   else
-    gunicorn \
+    exec gunicorn \
       --bind "${DIFY_BIND_ADDRESS:-0.0.0.0}:${DIFY_PORT:-5001}" \
       --workers ${SERVER_WORKER_AMOUNT:-1} \
       --worker-class ${SERVER_WORKER_CLASS:-gevent} \
       --preload \
       app:app
   fi
-fi
+fi