Add dependency install step

Author: jmccrae

.github/workflows/jekyll.yml

@@ -40,6 +40,8 @@ jobs:
           ruby-version: '3.1' # Not needed with a .ruby-version file
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically
           cache-version: 0 # Increment this number if you need to re-download cached gems
+      - name: Install dependencies
+        run: bundle install
       - name: Setup Pages
         id: pages
         uses: actions/configure-pages@v5