add cuda115 test matrix
# CUDA 11.5 | Linux
# The latest CUDA version matrix is intended to cover the highest supported combination.
-# - project: "cupy.linux.cuda115"
-# target: "cuda115"
-# system: "linux"
-# os: "ubuntu:20.04"
-# cuda: "11.5"
-# rocm: null
-# nccl: "2.11"
-# cutensor: "1.3"
-# cusparselt: "0.1.0"
-# cudnn: "8.3"
-# python: "3.9"
-# numpy: "1.21"
-# scipy: "1.7"
-# optuna: "2"
-# cython: "0.29"
-# env:CUPY_ACCELERATORS: "cutensor,cub"
-# test: "unit"
+- project: "cupy.linux.cuda115"
+ target: "cuda115"
+ system: "linux"
+ os: "ubuntu:20.04"
+ cuda: "11.5"
+ rocm: null
+ nccl: "2.11"
+ cutensor: "1.3"
+ cusparselt: "0.1.0"
+ cudnn: "8.3"
+ python: "3.10"
+ numpy: "1.21"
+ scipy: "1.7"
+ optuna: "2"
+ cython: "0.29"
+ env:CUPY_ACCELERATORS: "cutensor,cub"
+ test: "unit"
+
+# CUDA 11.5 (Multi-GPU) | Linux
+- project: "cupy.linux.cuda115.multi"
+ _inherits: "cupy.linux.cuda115"
+ target: "cuda115.multi"
+ test: "unit-multi"
###############################################################################
# CUDA (Windows)
