更改ci命令

.github/workflows/python-test.yml

@@ -9,14 +9,10 @@ on:
 jobs:
   build:
     runs-on: "ubuntu-latest"
-    container: python:latest
 
     steps:
       - uses: actions/checkout@v2
       - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install -r requirements.txt -i https://pypi.tuna.tsinghua.edu.cn/simple
+        run: pip install -r requirements.txt -i https://pypi.tuna.tsinghua.edu.cn/simple
       - name: Run tests
-        run: |
-          python -m unittest discover -s tests
+        run: python -m unittest discover -s tests