Brad Fitzpatrick 18e2936d25 github/workflows: move race tests to their own job
They're slow. Make them their own job that can run in parallel.

Also, only run them in race mode. No need to run them on 386
or non-race amd64.

Updates #7894

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2023-10-14 14:08:58 -07:00
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