Add step to install uv

Author: gvanrossum-ms

.github/workflows/ci.yml

@@ -11,6 +11,12 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Install uv
+        run: |
+          set -euxo pipefail
+          curl -LsSf https://astral.sh/uv/install.sh | sh
+          echo "$HOME/.local/bin" >> $GITHUB_PATH
+
       - name: make check
         run: |
           set -euxo pipefail