CI should install dependencies in a venv.

.github/workflows/python-app.yml

@@ -17,6 +17,13 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+      - name: Set up virtual environment
+        run: |
+          python -m venv venv
+          source venv/bin/activate
+      - name: Install dependencies
+        run: |
+          pip install -e .
       - name: Linting
         run: flake8 ./
       - name: unit test