Start CKAN 2.9.X with Gunicorn? - flask

Question

Is there a way to start CKAN 2.9 with gunicorn?
I can see from the documentation that gunicorn is mentioned:
Install Supervisor (a Process Control System) used to control
starting, stopping the uwsgi or gunicorn servers:
But not much information is in there.
Since 2.9 is flask I was looking at how to serve a flask application with Gunicorn an I came across this post: How To Serve Flask Applications with Gunicorn and Nginx on Ubuntu 18.04 and I tried by using this code (wsgi.py):
import os
from ckan.config.middleware import make_app
from ckan.cli import CKANConfigLoader
from logging.config import fileConfig as loggingFileConfig
app = None
if __name__ == "__main__":
config_filepath = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'ckan.ini')
abspath = os.path.join(os.path.dirname(os.path.abspath(__file__)))
loggingFileConfig(config_filepath)
config = CKANConfigLoader(config_filepath).get_config()
app = make_app(config)
Then running:
gunicorn --bind 0.0.0.0:5000 wsgi:app
But I get:
[2022-06-22 20:09:34 +0000] [365] [INFO] Starting gunicorn 20.1.0
[2022-06-22 20:09:34 +0000] [365] [INFO] Listening at: http://0.0.0.0:5000 (365)
[2022-06-22 20:09:34 +0000] [365] [INFO] Using worker: sync
[2022-06-22 20:09:34 +0000] [367] [INFO] Booting worker with pid: 367
Failed to find application object: 'app'
[2022-06-22 20:09:35 +0000] [367] [INFO] Worker exiting (pid: 367)
[2022-06-22 20:09:35 +0000] [365] [INFO] Shutting down: Master
[2022-06-22 20:09:35 +0000] [365] [INFO] Reason: App failed to load.
Any idea is appreciated