fix prefix issue

Signed-off-by: saurabhraghuvanshii <saurabhsraghuvanshi@gmail.com>

Author: saurabhraghuvanshii

.github/workflows/build-and-preview-site.yml

@@ -41,9 +41,10 @@ jobs:
         if: github.event.action != 'closed'
         run: npm ci
 
-      - name: Set PATH_PREFIX
+      - name: Set PATH_PREFIX for preview
         if: github.event.action != 'closed'
-        run: echo "PATH_PREFIX=layer5" >> $GITHUB_ENV
+        run: |
+          echo "PATH_PREFIX=pr-preview/pr-${{ github.event.pull_request.number }}" >> $GITHUB_ENV
 
       - name: Build PR preview
         if: github.event.action != 'closed'