Sporadic failure of screenshot tests

[kushalkolar]

Yesterday I started noticing failure of only one random job in our build matrix sometimes. The job passes if it's re-run without making any changes. It's really bizarre, the following are identical between the runs:

• the runner image and version
• OS, OS version
• apt packages, llvmpipe etc.
• pip installed packages
• wgpu backend

Failed job log: https://github.com/fastplotlib/fastplotlib/actions/runs/6741145455/job/18325292316?pr=351

Re-run with no changes: https://github.com/fastplotlib/fastplotlib/actions/runs/6741145455/job/18325388102#logs

diff examples:

all diffs: screenshot-diffs (2).zip

Mayb github actions added new hardware recently and jobs that get sent there fail 🤷‍♂️

We should probably implement this anyways pygfx/wgpu-py#400

@almarklein just FYI

[kushalkolar]

this doesn't hasn't happen in the past ~2 months, not sure what was up