CI: Allow PyPI push on manual workflow triggering

Author: siboehm

.github/workflows/ci.yml

@@ -39,7 +39,7 @@ jobs:
         shell: bash -x -l {0}
         run: ./.github/ci.sh ${{ matrix.PYTHON_VERSION }}
       - name: Publish a Python distribution to PyPI
-        if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags') && matrix.PYTHON_VERSION == '3.7'
+        if: startsWith(github.ref, 'refs/tags') && matrix.PYTHON_VERSION == '3.7'
         uses: pypa/gh-action-pypi-publish@v1.8.5
         with:
           user: __token__