add twine to publish package

Author: rfrerebe

.github/workflows/build.yml

@@ -16,6 +16,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade build
+        python -m pip install --upgrade twine
     - name: Set VERSION environment variable
       run: |
         echo GitHub_ref: $GITHUB_REF