Update main.yml

try to fix pdftex issue

Author: thijsjanzen

.github/workflows/main.yml

@@ -38,6 +38,11 @@ jobs:
       R_KEEP_PKG_SOURCE: yes
 
     steps:
+      - name: Install LaTeX
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y texlive-latex-base
+    
       - uses: actions/checkout@v3
 
       - uses: r-lib/actions/setup-pandoc@v2