Microsite is updated based on docs tag (#67)

* Microsite is updated only when pushing docs.* tags in master branch

.github/workflows/site.yml

@@ -22,7 +22,7 @@ jobs:
       - run: |
           ./scripts/createSite.sh ${{ github.ref }}
       - name: Release to GitHub Pages
-        if: github.event_name != 'pull_request'
+        if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/docs.')
         uses: JamesIves/[email protected]
         with:
           branch: gh-pages