Use requirements_test in Github CI

Author: jelly

.github/workflows/main.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install -r requirements.txt && pip install flake8 pytest pytest-cov pytest-django
+        pip install -r requirements.txt && pip install -r requirements_test.txt
     - name: Lint with flake8
       run: |
         make lint