gevent not found when running 0.34 builds

[halilduygulu]

Describe the bug
gevent lib is not installed on container and when it starts worker I see following error.
I do not understand how did you managed to run this version without seeing this error.

To Reproduce
Steps to reproduce the behavior:

1. use latest images with tag 0.34.0 or 0.34.0rc1 from dockerhub
2. Running on prod and compose parameters
3. After workers started I see log
   Started Celery workers[worker1, worker2] and Flower UI.
4. After server starts I see in the log
   File "/usr/local/lib/python3.6/site-packages/gunicorn/workers/ggevent.py", line 22, in
   73218f80f0a8bcaaa3f5f9d2c04fcabd8fa3a4feb0619aeb716e09856a865a85
   raise RuntimeError("You need gevent installed to use this worker.")

Expected behavior
If I switch back to 0.33.0rc1 which is current latest, it works with everything else is same.

Additional context
Running on aws ECS, but should not have an effect on this error.

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[abhioncbr]

Thanks for notifying it. Let me try to test it as per the mentioned steps.

[ivanmartos]

just a short info - this happens when you run in it prod mode. In local mode it works

[abhioncbr]

@ivanmartos Thanks for the update. Would you like to raise a PR for a fix?