Fix the test workflow.

Author: shyuep

.github/workflows/test.yml

@@ -129,7 +129,9 @@ jobs:
         name: Install Python
         with:
           python-version: "3.10"
-      - run: python -m pip install build
+      - run: |
+          python -m pip install build
+          pip install -e .
       - name: Build sdist
         run: python -m build --sdist
       - uses: actions/upload-artifact@v3