add sphinx workflow

.github/workflows/sphinx.yml

@@ -0,0 +1,25 @@
+name: documentation
+
+on: [push, pull_request, workflow_dispatch]
+permissions:
+ contents: write
+jobs:
+ docs:
+ runs-on: ubuntu-latest
+ steps:
+ - uses: actions/checkout@v3
+ - uses: actions/setup-python@v3
+ - name: Install dependencies
+   run: |
+       pip install sphinx sphinx_rtd_theme myst_parser
+ - name: Sphinx build
+   run: |
+     sphinx-build doc _build
+ - name: Deploy to GitHub Pages
+   uses: peaceiris/actions-gh-pages@v3
+   if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
+   with:
+     publish_branch: gh-pages
+     github_token: ${{ secrets.GITHUB_TOKEN }}
+     publish_dir: _build/
+     force_orphan: true