Require build for deployment.

.github/workflows/python-publish.yml

@@ -22,7 +22,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install setuptools wheel twine
+        pip install setuptools wheel twine build
         pip install -r requirements.txt
         pip install .
     - name: Build and publish