tweak gh-pages workflow for admonish install

.github/workflows/gh-pages.yml

@@ -16,17 +16,24 @@ permissions:
 jobs:
   generate-docs:
     runs-on: ubuntu-latest
+    container: docker.io/node:20-bullseye-slim
     timeout-minutes: 2
     steps:
       - uses: actions/checkout@v4
       - name: Setup mdBook
-        uses: peaceiris/actions-mdbook@v1
-        with:
-          mdbook-version: '0.4.35'
+        run: |
+          apt-get update
+          apt-get install curl -y
+          mkdir mdbook
+          curl -sSL https://github.com/rust-lang/mdbook/releases/download/v0.4.37/mdbook-v0.4.37-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=./mdbook
+          curl -sSL  https://github.com/tommilligan/mdbook-admonish/releases/download/v1.15.0/mdbook-admonish-v1.15.0-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=./mdbook
+          echo `pwd`/mdbook >> $GITHUB_PATH
+      - name: Build with mdBook
+        run: |
+          cd docs
+          mdbook build
       - name: Setup Pages
         uses: actions/configure-pages@v4
-      - name: Build with mdBook
-        run: cd docs && mdbook build
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3
         with: