[MNT] move CI installs to uv (#661)

Moves the CI installs to `uv` - this has no impact on the packaging or
UX, but speeds up the CI VM setup significantly.

Also adds a display step for installed packages for potential
diagnostics.

Author: fkiraly

.github/workflows/codecov.yml

@@ -19,15 +19,27 @@ jobs:
     steps:
       - uses: actions/checkout@v5
 
+      - name: Install uv
+        uses: astral-sh/setup-uv@v7
+        with:
+          enable-cache: true
+
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
-          cache: "pip"
+
+      - name: Display Python version
+        run: python -c "import sys; print(sys.version)"
 
       - name: Install dependencies
-        run: |
-          pip install ".[dev,all_extras]"
+        shell: bash
+        run: uv pip install ".[dev,all_extras]" --no-cache-dir
+        env:
+          UV_SYSTEM_PYTHON: 1
+
+      - name: Show dependencies
+        run: uv pip list
 
       - name: Generate coverage report
         run: |

.github/workflows/main.yml

@@ -28,15 +28,27 @@ jobs:
     steps:
       - uses: actions/checkout@v5
 
+      - name: Install uv
+        uses: astral-sh/setup-uv@v7
+        with:
+          enable-cache: true
+
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
-          cache: "pip"
+
+      - name: Display Python version
+        run: python -c "import sys; print(sys.version)"
 
       - name: Install dependencies
-        run: |
-          pip install ".[dev,all_extras]"
+        shell: bash
+        run: uv pip install ".[dev,all_extras]" --no-cache-dir
+        env:
+          UV_SYSTEM_PYTHON: 1
+
+      - name: Show dependencies
+        run: uv pip list
 
       - name: Test with pytest
         run: |