add cupy tests (#2858)

Signed-off-by: Wenqi Li <[email protected]>

Author: wyli

.github/workflows/pythonapp-gpu.yml

@@ -4,7 +4,6 @@ on:
   # quick tests for pull requests and the releasing branches
   push:
     branches:
-      - dev
       - main
       - releasing/*
   pull_request:
@@ -92,6 +91,9 @@ jobs:
         python get-pip.py && \
         rm get-pip.py;
         fi
+    - if: matrix.environment == 'PT19+CUDA113'
+      name: Optional Cupy dependency (cuda113)
+      run: echo "cupy-cuda113" >> requirements-dev.txt
     - name: Install dependencies
       run: |
         which python