auto detect python version

Author: hipudding

.github/workflows/_build-and-test.yml

@@ -52,7 +52,7 @@ jobs:
         working-directory: /root/build/npu/pytorch
         run: |
           pip install -r requirements.txt -i https://pypi.tuna.tsinghua.edu.cn/simple
-          bash ci/build.sh --python=3.8
+          bash ci/build.sh --python=`python --version | awk '{print $2}' | cut -d '.' -f 1,2`
           pip3 install dist/torch_npu*.whl
       - name: Do the test
         working-directory: /root/build