build: add poetry build

Author: uriahf

.github/workflows/python-package.yml

@@ -56,6 +56,9 @@ jobs:
       uses: actions/setup-python@v3
       with:
         python-version: '3.x'
+    - name: Build package
+      run: |
+        poetry build
     - name: Publish package
       env:
         TWINE_USERNAME: ${{ secrets.TWINE_USERNAME }}