Add build docs action

.github/workflows/docs.yaml

@@ -0,0 +1,27 @@
+name: Publish Docs
+
+on: [push, pull_request, workflow_dispatch]
+
+permissions:
+  contents: write
+
+jobs:
+  build-docs:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install zint
+        run: pip install .[docs]
+
+      - name: Build docs
+        run: sphinx-build docs build
+
+      - name: Deploy to GitHub Pages
+        if: ${{ (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && github.ref == 'refs/heads/main' }}
+        uses: JamesIves/github-pages-deploy-action@v4
+        with:
+          folder: build