Publish package only for tags

Author: matei0494

.github/workflows/release.yml

@@ -41,6 +41,7 @@ jobs:
     - name: Test package 
       run: pip install --no-cache-dir dist/ops*.tar.gz && ops --verbose -h
     - name: Publish package
+      if: startsWith(github.ref, 'refs/tags/')
       uses: pypa/gh-action-pypi-publish@ab69e431e9c9f48a3310be0a56527c679f56e04d
       with:
         user: __token__