Docker-airflow: Incompatible with newly released Werkzeug 1.0.0

[jsnod]

v1.0.0 of Werkzeug was just released, and it now breaks builds with:

ImportError: cannot import name 'secure_filename' from 'werkzeug'

According to the changelog, top-level attributes were removed in 1.0:

Deprecate most top-level attributes provided by the werkzeug module in favor of 
direct imports. The deprecated imports will be removed in version 1.0. For example, 
instead of import werkzeug; werkzeug.url_quote, do from werkzeug.urls 
import url_quote. 

The workaround for now is to pin the old version in the Dockerfile:

pip install werkzeug==0.16.1

[liorhar]

Airflow version 1.10.9 fixes that. Maybe this project needs to upgrade to resolve this issue.
https://airflow.apache.org/docs/stable/changelog.html#airflow-1-10-9-2020-02-10

[puckel]

@jsnod It's already "fixed" in docker-ariflow 1.10.8 cf 0d9b032