Merge pull request #1449 from FluxML/tb/ci

Update GPU CI.

Author: DhairyaLGandhi

.buildkite/pipeline.yml

@@ -1,9 +1,10 @@
 steps:
-  - label: "GPU Integeration"
+  - label: "GPU integration"
     plugins:
       - JuliaCI/julia#v0.5:
           version: '1.5'
-      - JuliaCI/julia-test#v0.3:
+      - JuliaCI/julia-test#v0.3: ~
     agents:
       queue: "juliagpu"
+      cuda: "*"
     timeout_in_minutes: 60