CI output for MIRI is unhelpful

[joseph-gio]

What went wrong

Currently, the error messages when MIRI fails are very unhelpful. Example: https://github.com/bevyengine/bevy/runs/7737193448?check_suite_focus=true.

Additional information

#4959 has a way to get a better error message, but you need to be on Linux to successfully run bevy's test suite in MIRI. Also, this requires running the entire bevy test suite one at a time. We shouldn't expect contributors to be running all that when we could be doing it on Microsoft's dime.

[james7132]

Do we still have the miri output from this? If not, this is likely unactionable, as the logs have been deleted via TTL, and #4959 has been merged as well.

[joseph-gio]

This wasn't about any specific error, just the format that CI delivers MIRI error messages in. I'll have to see if this is still an issue. (#4959 was already merged when this issue was opened).

[james7132]

Revisiting this, I don't think I've had any issues with the miri CI outputs as of late, particularly with potential UB heavy PRs like #20772.

[joseph-gio]

happy to close this -- we can make a new issue if someone else has problems