Support constraints.txt

[Youssef1313]

Feature Request

https://pip.pypa.io/en/stable/user_guide/#constraints-files

When constraints.txt exists, it should be picked up and used.

ie, if both requirements.txt and constraintx.txt are present, installation should happen with pip install -r requirements.txt -c constraints.txt

[william-msft]

Hi @Youssef1313, thank you for reaching out! We have added this work item to our board for future development.

[michaelconan]

+1 !!!

In the meantime, can this be applied via a custom build command or any environment variable?