fixup! [CI] Added preview bot

Author: mnocon

.github/workflows/preview_comment.yaml

@@ -6,10 +6,6 @@ on:
 jobs:
     post-preview-links:
         name: Post preview links for changed files
-        runs-on: ubuntu-latest
-        permissions:
-            # Needed to manage the comment
-            pull-requests: write
         uses: ibexa/documentation-developer/.github/workflows/preview_comment.yaml@master
         with:
             project: 'projects/userguide/'