ci: publish documentation site

.github/workflows/docs.yml

@@ -0,0 +1,58 @@
+name: Documentation
+
+on:
+  pull_request:
+    paths:
+      - "docs/**"
+      - ".github/workflows/docs.yml"
+  push:
+    branches: [main]
+    paths:
+      - "docs/**"
+      - ".github/workflows/docs.yml"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  build:
+    name: Build Markdown manual
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Check out source
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+      - name: Configure GitHub Pages
+        uses: actions/configure-pages@v5
+
+      - name: Install mdBook
+        run: cargo install mdbook --version 0.5.2 --locked
+
+      - name: Build the site
+        run: mdbook build docs
+
+      - name: Upload Pages artifact
+        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+        uses: actions/upload-pages-artifact@v4
+        with:
+          path: target/docs
+
+  deploy:
+    name: Deploy documentation
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    needs: build
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4