split workflow; checkout create-preview-links from trunk

.github/workflows/preview-theme.yml

@@ -3,6 +3,8 @@ name: Preview Theme Changes
 on:
   pull_request_target:
     types: [opened, synchronize]
+permissions:
+  pull-requests: write
 
 jobs:
   check-for-changes-to-themes:
@@ -43,10 +45,21 @@ jobs:
           echo "HAS_THEME_CHANGES=true" >> $GITHUB_OUTPUT
           echo "CHANGED_THEMES=$(echo ${unique_dirs[@]})" >> $GITHUB_ENV
           echo "Theme directories with changes: $CHANGED_THEMES"
+  
+  handle-pr-comment:
+    runs-on: ubuntu-latest
+    needs: check-for-changes-to-themes
+    steps:
+      - name: Checkout create-preview-links script from trunk
+        uses: actions/checkout@v2
+        with:
+          repository: Automattic/themes
+          path: .github/scripts
+          ref: trunk
 
       - name: Add Preview Links comment
         id: comment-on-pr
-        if: ${{ steps.check-for-changes.outputs.HAS_THEME_CHANGES == 'true' }}
+        if: ${{ needs.check-for-changes-to-themes.outputs.HAS_THEME_CHANGES == 'true' }}
         uses: actions/github-script@v7
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
@@ -55,7 +68,7 @@ jobs:
             createPreviewLinks(github, context, process.env.CHANGED_THEMES);
 
       - name: Remove comment if no changes are detected
-        if: ${{ steps.check-for-changes.outputs.HAS_THEME_CHANGES == 'false' }}
+        if: ${{ needs.check-for-changes-to-themes.outputs.HAS_THEME_CHANGES == 'false' }}
         uses: actions/github-script@v7
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
@@ -75,4 +88,4 @@ jobs:
                 repo: context.repo.repo
               });
             }
- 
+