fix(ci): Fix GH token permissions for docs build

Author: AdrianoKF

.github/workflows/release.yaml

@@ -12,6 +12,9 @@ jobs:
   build:
     name: Build source distribution and wheel
     runs-on: ubuntu-latest
+    permissions:
+      # docs build pushes to the gh-pages branch
+      contents: write
     services:
       lakefs: # required for building documentation
         image: treeverse/lakefs:latest