ci-fairy minio ls will try to list files in the path given, which for
trace buckets is generally forbidden. We don't really need to do any
listing in this case, so use wget instead to check that the reference
image doesn't exist yet.
Previous to this patch, trace jobs would re-upload all reference images
to minio every time because they wouldn't be able to verify that the
reference image was already there. Jobs would often take up to 4 minutes
needlessly re-uploading these files.
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Emma Anholt <emma@anholt.net>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10953>
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