Fix CI: use working-directory: app

.gitea/workflows/ci.yml

@@ -9,6 +9,7 @@ on:
 jobs:
   test:
     runs-on: ubuntu-latest
+    working-directory: app
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
@@ -17,7 +18,6 @@ jobs:
       - name: Run tests and linting
         run: |
           python -m pip install --upgrade pip
-          cd app
           pip install -e ".[dev]"
           python -m pytest tests/ -v --cov=src --cov-report=term-missing
           pip install ruff