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ci: compress LAVA rootfs with zstd instead of gzip

David Heidelberg requested to merge dh/mesa:zstd into main

Visible size reduction and minor performance improvement at no cost.

rootfs measure:

2022-07-27 11:15:16.235268: 475MB downloaded in 111.59s (4.26MB/s)
2022-07-27 15:07:40.984857: 425MB downloaded in 85.57s (4.97MB/s)

So let say approx. 95s vs 85s if we assume 5MB/s, which can bring us 10s speedup... EDIT: Don't count the fact that compression and decompression are faster than with gzip.

Signed-off-by: David Heidelberg david.heidelberg@collabora.com

/cc @tomeu @gallo @anholt @daniels

Edited by David Heidelberg

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