ci: install fonts for jekyll-og-image generation

Add Plus Jakarta Sans and Inter fonts to the docs workflow to ensure
proper rendering of Open Graph images with the configured typography

Author: crmne

.github/workflows/docs.yml

@@ -39,6 +39,25 @@ jobs:
           sudo apt-get update -qq
           sudo apt-get install -y --no-install-recommends libvips-dev
 
+      - name: Install fonts for OG image generation
+        run: |
+          # Install Inter font from apt
+          sudo apt-get install -y fonts-inter fonts-inter-variable
+
+          # Download and install Plus Jakarta Sans from Google Fonts
+          wget -O Plus_Jakarta_Sans.zip "https://fonts.google.com/download?family=Plus%20Jakarta%20Sans"
+          sudo mkdir -p /usr/share/fonts/truetype/plus-jakarta-sans
+          sudo unzip -d /usr/share/fonts/truetype/plus-jakarta-sans/ Plus_Jakarta_Sans.zip
+          rm Plus_Jakarta_Sans.zip
+
+          # Update font cache
+          sudo fc-cache -fv
+
+          # Verify fonts are installed
+          echo "Installed fonts:"
+          fc-list | grep -i inter || echo "Inter font not found"
+          fc-list | grep -i jakarta || echo "Plus Jakarta Sans not found"
+
       - name: Setup Ruby for Jekyll build (ruby_llm environment)
         uses: ruby/setup-ruby@v1
         with:

docs/_config.yml

@@ -80,6 +80,9 @@ og_image:
   domain: "rubyllm.com"
   header:
     prefix: "RubyLLM Docs: "
+    font_family: "Plus Jakarta Sans, bold"
+  content:
+    font_family: "Inter, regular"
   metadata:
     fields:
       - description