cfg: source-only distribution

Author: yoyolicoris

.github/workflows/python-publish.yml

@@ -35,7 +35,7 @@ jobs:
         python -m pip install --upgrade pip
         pip install build
     - name: Build package
-      run: python -m build
+      run: python -m build --sdist
     - name: Publish package
       uses: pypa/gh-action-pypi-publish@27b31702a0e7fc50959f5ad993c78deac1bdfc29
       with: