Allow copying artifacts to /output in case of test failure on docker

[kunitoki]

Description

I am running rendering tests in cibuildwheel on all platforms, and while macOS and Windows can access the project folder easily, on linux because we run in a docker, the only place we can access generated artifacts during the build/testing phase is by copying them into /output.

The problem arises from the fact that if the tests fails (rendering tests compares generated images with reference ones in the project folder), i will have my generated images and diff images that i place in /output but this will never hit because the test failure generated a CalledProcessError and terminated the loop.

Would it be possible to add a feature to be able to extract artifacts in case of failures as well ?

Build log

No response

CI config

No response