Change Dockerfile entrypoint to adapt new env_file parameter (#781)

### Description

Please explain the changes you made here.

### Checklist

- [ ] Created tests which fail without the change (if possible)
- [ ] All tests passing
- [ ] Extended the documentation, if necessary

Author: Rotheem

Dockerfile

@@ -15,4 +15,4 @@ COPY migrations migrations/
 COPY assets assets/
 COPY app app/
 
-ENTRYPOINT ["fastapi", "run", "app/main.py", "--workers", "${NB_WORKERS:-1}"]
+ENTRYPOINT fastapi run app/main.py --workers "${NB_WORKERS:-1}"