add uv to pytest

Author: kellerza

.github/workflows/python-app.yml

@@ -67,6 +67,10 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: ${{ env.DEFAULT_PYTHON }}
+      - name: Install uv
+        uses: astral-sh/setup-uv@v7
+        with:
+          version: ${{ env.UV_VERSION }}
       - name: Install Requirements
         run: uv sync --frozen --all-extras
       - name: Test with pytest (skip entirely if secrets missing)