ci: Define workflow to only build document

.github/workflows/deploy-docs.yml

@@ -0,0 +1,31 @@
+name: 'Deploy doc'
+
+on:
+  push:
+    branches:
+      - 'main'
+  workflow_dispatch:
+
+jobs:
+  deploy-doc:
+    runs-on: ubuntu-latest
+    permissions:
+      pages: write
+      id-token: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: astral-sh/setup-uv@v2
+      - uses: arduino/setup-task@v2
+      - name: Build document
+        run: |
+          task setup docs:build
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: docs/_build/mini18n-dirhtml
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4