Update main.yml

Author: dapavlik

.github/workflows/main.yml

@@ -16,7 +16,7 @@ jobs:
         python -m pip install --upgrade pip
         pip install build
     - name: Build a source tarball
-      # if: startsWith(github.ref, 'refs/tags')
+      if: startsWith(github.ref, 'refs/tags')
       run: |
         pipenv run python setup.py sdist
     - name: Publish distribution 📦 to PyPI