Fix CI: combine all steps into one

.gitea/workflows/ci.yml

@@ -9,21 +9,16 @@ on:
 jobs:
   test:
     runs-on: ubuntu-latest
-    defaults:
-      run:
-        working-directory: ./app
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
           python-version: '3.11'
-      - name: Install dependencies
+      - name: Run tests and linting
         run: |
           python -m pip install --upgrade pip
+          cd app
           pip install -e ".[dev]"
-      - name: Run tests
-        run: python -m pytest tests/ -v --cov=src --cov-report=term-missing
-      - name: Check linting
-        run: |
+          python -m pytest tests/ -v --cov=src --cov-report=term-missing
           pip install ruff
           ruff check .