Use mdbook from release and don't compile

Author: nakedible

.github/workflows/mdbook.yml

@@ -34,9 +34,9 @@ jobs:
       - uses: actions/checkout@v4
       - name: Install mdBook
         run: |
-          curl --proto '=https' --tlsv1.2 https://sh.rustup.rs -sSf -y | sh
-          rustup update
-          cargo install --version ${MDBOOK_VERSION} mdbook
+          mkdir mdbook
+          curl -sSL https://github.com/rust-lang/mdBook/releases/download/v${MDBOOK_VERSION}/mdbook-v${MDBOOK_VERSION}-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=./mdbook
+          echo "$PWD/mdbook" >> $GITHUB_PATH
       - name: Setup Pages
         id: pages
         uses: actions/configure-pages@v5