Add missing build dependency in CI

.github/workflows/ci_test.yml

@@ -66,7 +66,7 @@ jobs:
         sudo apt install libopenmpi-dev
     - name: Build
       run: |
-        python -m pip install --upgrade pip setuptools wheel
+        python -m pip install --upgrade pip setuptools wheel build
         pip install -r requirements.txt
         make dist
     - name: Test the sdist