Install build dependency for publishing to PyPI

.github/workflows/publish.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install setuptools wheel pytest
+          python -m pip install setuptools wheel pytest build
           pip install .
       - name: Lint with black
         uses: psf/black@stable