test on Skylake Xeons on Linux to cover AVX-512

Seems to be working, so let's keep it that way.

Change-Id: I3bf03962f974d9b3833c0765531ce3e6960a871f
Reviewed-on: https://skia-review.googlesource.com/c/skcms/+/197830
Auto-Submit: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
2 files changed