tests, gpu-compute, mem-ruby: add GPU Ruby random test to nightly

Add a longer test for the GPU Ruby random tester to the nightly
regression.  This test is sized to take approximately 30 minutes
while providing more coverage than the per check-in Ruby random test,
which takes 30 seconds.

Change-Id: I398feb1283b24f801275ba13d6c53d236849f2eb
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/59272
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed