Add check job to pr on master and deploy only on master push

Author: Skillkiller

.github/workflows/jekyll-gh-pages.yml

@@ -2,20 +2,17 @@
 name: Deploy Jekyll with GitHub Pages dependencies preinstalled
 
 on:
-  # Runs on pushes targeting the default branch
   push:
     branches: ["master"]
-
-  # Allows you to run this workflow manually from the Actions tab
+  pull_request:
+    branches: ["master"]
   workflow_dispatch:
 
-# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
 permissions:
   contents: read
   pages: write
   id-token: write
 
-# Allow one concurrent deployment
 concurrency:
   group: "pages"
   cancel-in-progress: true
@@ -70,8 +67,8 @@ jobs:
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3
 
-  # Deployment job
   deploy:
+    if: github.event_name == 'push' && github.ref == 'refs/heads/master'
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}