fix: add contents: write permission to docs workflow to allow gh-pages push

Author: Copilot

.github/workflows/docs.yml

@@ -13,6 +13,8 @@ jobs:
   docs:
     if: github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/v') || (github.event_name == 'pull_request_review' && github.event.review.state == 'approved')
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
     steps:
       - uses: compas-dev/compas-actions.docs@v5
         with: