ci: hook network-io tests into the pipeline
This runs the "pip install" tests once for Python 2 and 3 each.
This instance will be updated to Heptapod 18.6.0rc1 on 2025-12-08 between 11:00 and 12:00 UTC+1 (Europe/Paris)
This runs the "pip install" tests once for Python 2 and 3 each.