manylinux wheel builds failing

[dstansby]

Describe the bug

Tests on the manylinux wheel builds are failing, because they can't import cv2. e.g. https://github.com/sunpy/sunpy/actions/runs/3806622178/jobs/6475753826. Error is:

import cv2
  E           ImportError: /lib64/libz.so.1: version `ZLIB_1.2.9' not found (required by /tmp/tmp.sIYIruBBDr/venv/lib/python3.8/site-packages/cv2/../opencv_python.libs/libpng16-186fce2e.so.16.37.0)

To Reproduce

import sunpy

sunpy.map.Map(...)
etc

Screenshots

No response

System Details

No response

Installation method

No response

[dstansby]

Looks like opencv/opencv-python#765 is the upstream issue

[nabobalis]

Can we pin the version in our tests for now to avoid this?

Oh, I assume our wheels don't use that infrastructure. I wonder if changing test_command to include a pip install opencv_python == 4.6.0.66 && would be enough?

Hmm, I don't think that would work on windows?

[ConorMacBride]

Adding this configuration to pyproject.toml will work with the OpenAstronomy template https://cibuildwheel.readthedocs.io/en/stable/options/#test-requires

[nabobalis]

Ah I didn't know that. Thanks, I will PR something.