Use repo name in base url

Author: carlos-granados

.github/workflows/preview.yml

@@ -25,7 +25,7 @@ jobs:
         if: github.event.action != 'closed'
 
       - name: Build with Jekyll
-        run: bundle exec jekyll build --baseurl "/pr-preview/pr-${{ github.event.pull_request.number }}"
+        run: bundle exec jekyll build --baseurl "/${{ github.event.repository.name }}/pr-preview/pr-${{ github.event.pull_request.number }}"
         env:
           JEKYLL_ENV: production
         if: github.event.action != 'closed'