feat: change main github action install method

Author: guerinclement

.github/workflows/main.yml

@@ -20,7 +20,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install build flake8 pytest
-        if [ -f requirements.dev.txt ]; then pip install -r requirements.dev.txt; fi
+        pip install .[test]
 
     - name: Lint with flake8
       run: |