Add Setup mdBook step

Author: brainwo

.github/workflows/publish.yml

@@ -24,6 +24,11 @@ jobs:
         uses: actions/checkout@v4
       - name: Setup Pages
         uses: actions/configure-pages@v5
+      - name: Setup mdBook
+        uses: peaceiris/actions-mdbook@v2
+        with:
+          mdbook-version: "0.4.40"
+      - run: mdbook build mdbook
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3
         with: