ci: add package check

Author: foosel

.github/workflows/build.yml

@@ -19,10 +19,13 @@ jobs:
           python-version: "3.10"
       - name: 🏗 Install build dependencies
         run: >-
-          python -m pip install wheel build --user
+          python -m pip install wheel build twine --user
       - name: 🔨 Build a binary wheel and a source tarball
         run: >-
           python -m build
+      - name: 🧪 Check that twine is happy with it
+        run: >-
+          twine check --strict dist/*
       - name: ⬆ Upload build result
         uses: actions/upload-artifact@v4
         with: