[misc] Set up buildbot for gpu tests on linux (#2305)
[misc] Set up buildbot for gpu tests on linux (#2305)

* set up buildbot

* cn label

Co-authored-by: Ye Kuang <2bdcc59e557c3c79078a8f7ec8df5ef240a84346@gmail.com>
yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi