Use the new --system flag for uv in test.yml (#200)

.github/workflows/test.yml

@@ -62,17 +62,8 @@ jobs:
       - name: Install uv (Unix)
         if: ${{ runner.os != 'Windows' }}
         run: curl -LsSf https://astral.sh/uv/install.sh | sh
-      - name: Create and activate a virtual environment
-        shell: bash
-        # uv doesn't (yet) allow us to install packages globally;
-        # we have to create and activate a virtual environment
-        run: |
-          uv venv .venv
-          echo "VIRTUAL_ENV=.venv" >> $GITHUB_ENV
-          echo "$PWD/.venv/bin" >> $GITHUB_PATH
-          echo "$GITHUB_WORKSPACE\\.venv\\Scripts" >> $GITHUB_PATH
       - name: Install dependencies
-        run: uv pip install -e ".[pytest]"
+        run: uv pip install -e ".[pytest]" --system
       - run: uv pip freeze
       - name: Run tests under coverage
         run: |