[CI] Speed up test workflow install phase by using uv (#254)

* [CI] Speed up install phase by using uv

* [CI] Use uv in examples workflow

* [CI] Fix yml syntax

* [CI] Install uv into system env

* [CI] Add system install for examples workflow

.github/workflows/pytest.yml

@@ -30,17 +30,15 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
+      - name: uv
+        uses: astral-sh/setup-uv@v5
 
       - name: Install
         run: |
-          python -m pip install --upgrade pip
-          pip install wheel
-          pip install .
-          pip install pytest
-          pip install pytest-cov
-          pip install pytest-benchmark
-          pip install hypothesis
-          pip freeze
+          uv pip install wheel --system
+          uv pip install . --system
+          uv pip install pytest pytest-cov pytest-benchmark hypothesis --system
+          uv pip freeze --system
 
       - name: Run tests
         run: pytest --cov=pyerrors -vv