Update jekyll.yml

.github/workflows/jekyll.yml

@@ -16,7 +16,7 @@ on:
 
 # Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
 permissions:
-  contents: write
+  contents: read
   pages: write
   id-token: write
 
@@ -50,6 +50,12 @@ jobs:
       - name: Upload artifact
         # Automatically uploads an artifact from the './_site' directory by default
         uses: actions/upload-pages-artifact@v3
+      - name: Add apt key
+        run: |
+          wget -nv -O - https://wkhtmltopdf.org/downloads/apt/debian/wkhtmltopdf.key | sudo apt-key add -
+          echo "deb https://wkhtmltopdf.org/downloads/apt/debian/ stretch main" | sudo tee /etc/apt/sources.list.d/wkhtmltopdf.list
+      - name: Install wkhtmltopdf
+        run: apt-get update && apt-get install -y wkhtmltopdf
       - name: Install wkhtmltopdf
         run: apt-get update && apt-get install -y wkhtmltopdf
       - name: Generate PDF