ci: add action to publish to gh-pages

.github/workflows/docs-pages.yml

@@ -0,0 +1,46 @@
+name: Deploy Sphinx documetation site to Pages
+
+on:
+    push:
+        branches:
+            - main
+    workflow_dispatch:
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+    contents: read
+    pages: write
+    id-token: write
+
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
+concurrency:
+    group: "pages"
+    cancel-in-progress: false
+
+jobs:
+    build:
+        runs-on: "ubuntu-latest"
+        steps:
+            - uses: actions/checkout@v4
+            - uses: actions/setup-python@v5
+              with:
+                  python-version: "3.12"
+                  cache: "pip"
+                  cache-dependency-path: "constraints*.txt"
+            - run: python -m pip install -c constraints.txt tox
+            - run: tox -e docs
+            - uses: actions/configure-pages@v4
+            - uses: actions/upload-pages-artifact@v3
+              with:
+                  path: "build/docs"
+    deploy:
+        environment:
+            name: github-pages
+            url: ${{ steps.deployment.outputs.page_url }}
+        runs-on: ubuntu-latest
+        needs: build
+        steps:
+            - name: Deploy to GitHub Pages
+              id: deployment
+              uses: actions/deploy-pages@v4