ci: Also build

Author: kkrypt0nn

.github/workflows/ci.yml

@@ -37,6 +37,9 @@ jobs:
       - name: Install Python packages
         run: |
           python -m pip install --upgrade pip
-          pip install -r requirements.txt
+          python -m pip install -r requirements.txt
+          python -m pip install build
+      - name: Build
+        run: python -m build
       - name: Test
         run: python -m unittest discover tests