Fix publish action

Author: saimn

.github/workflows/publish.yml

@@ -10,7 +10,7 @@ jobs:
   build-n-publish:
     name: Build and publish Python 🐍 distributions 📦 to PyPI
     runs-on: ubuntu-latest
-    if: (github.repository == 'astropy/sphinx-astropy' && (github.event_name == 'tags' || contains(github.event.pull_request.labels.*.name, 'Build wheels')))
+    if: ((github.event_name == 'push' && startsWith(github.ref, 'refs/tags')) || contains(github.event.pull_request.labels.*.name, 'Build wheels'))
 
     steps:
     - uses: actions/checkout@v2