Update pdf.yml

.github/workflows/pdf.yml

@@ -4,12 +4,18 @@ on:
   push:
     branches:
       - main
+  pull_request:
+    types:
+      - closed
+    branches:
+      - main
   workflow_dispatch: {}
 
 jobs:
   converttopdf:
     name: build-release-pdf
     runs-on: ubuntu-latest
+    if: github.event.pull_request.merged == true || github.event_name == 'push' || github.event_name == 'workflow_dispatch'
     steps:
       - id: today
         run: echo "name=$(date +'%Y-%m-%d')" >> $GITHUB_ENV
@@ -19,7 +25,7 @@ jobs:
 
       # Install pandoc and xelatex
       - name: Install dependencies
-        run: sudo apt-get update && sudo apt-get install -y pandoc texlive-xetex
+        run: sudo apt-get install -y pandoc texlive-xetex
 
       # Create directory for PDFs
       - name: Create PDF directory