docker-compose up in default_configs ModuleNotFoundError: No module named '_wsgi'

docker-compose up
Creating network "default_configs_default" with the default driver
Creating ml-backend ... done
Attaching to ml-backend
ml-backend | Traceback (most recent call last):
ml-backend | File "/usr/local/bin/gunicorn", line 8, in
ml-backend | sys.exit(run())
ml-backend | File "/usr/local/lib/python3.8/site-packages/gunicorn/app/wsgiapp.py", line 67, in run
ml-backend | WSGIApplication("%(prog)s [OPTIONS] [APP_MODULE]").run()
ml-backend | File "/usr/local/lib/python3.8/site-packages/gunicorn/app/base.py", line 231, in run
ml-backend | super().run()
ml-backend | File "/usr/local/lib/python3.8/site-packages/gunicorn/app/base.py", line 72, in run
ml-backend | Arbiter(self).run()
ml-backend | File "/usr/local/lib/python3.8/site-packages/gunicorn/arbiter.py", line 58, in __init__
ml-backend | self.setup(app)
ml-backend | File "/usr/local/lib/python3.8/site-packages/gunicorn/arbiter.py", line 118, in setup
ml-backend | self.app.wsgi()
ml-backend | File "/usr/local/lib/python3.8/site-packages/gunicorn/app/base.py", line 67, in wsgi
ml-backend | self.callable = self.load()
ml-backend | File "/usr/local/lib/python3.8/site-packages/gunicorn/app/wsgiapp.py", line 58, in load
ml-backend | return self.load_wsgiapp()
ml-backend | File "/usr/local/lib/python3.8/site-packages/gunicorn/app/wsgiapp.py", line 48, in load_wsgiapp
ml-backend | return util.import_app(self.app_uri)
ml-backend | File "/usr/local/lib/python3.8/site-packages/gunicorn/util.py", line 359, in import_app
ml-backend | mod = importlib.import_module(module)
ml-backend | File "/usr/local/lib/python3.8/importlib/__init__.py", line 127, in import_module
ml-backend | return _bootstrap._gcd_import(name[level:], package, level)
ml-backend | File "", line 1014, in _gcd_import
ml-backend | File "", line 991, in _find_and_load
ml-backend | File "", line 973, in _find_and_load_unlocked
ml-backend | ModuleNotFoundError: No module named '_wsgi'

`docker-compose up` or `docker-compose build` does not transform `_wsgi.py.tmpl` to a valid `_wsgi.py`. Please fix `Dockerfile` or change `README.md`