Update hugo.yml

Author: myrkvi

.github/workflows/hugo.yml

@@ -37,6 +37,8 @@ jobs:
         run: |
           wget -O ${{ runner.temp }}/hugo.deb https://github.com/gohugoio/hugo/releases/download/v${HUGO_VERSION}/hugo_extended_${HUGO_VERSION}_linux-amd64.deb \
           && sudo dpkg -i ${{ runner.temp }}/hugo.deb
+      - name: Install Asciidoctor
+        run: sudo apt-get install -y asciidoctor
       - name: Install Dart Sass
         run: sudo snap install dart-sass
       - name: Checkout