Merge pull request #847 from aws-powertools/fix/changelog-write

chore(ci): update build_changelog.yml

Author: hjgraca

.github/workflows/build_changelog.yml

@@ -6,7 +6,10 @@ on:
 
 permissions:
   contents: read
-
+  
 jobs:
   changelog:
+    permissions:
+      contents: write       # create temporary branch to store changelog changes
+      pull-requests: write  # create PR with changelog changes
     uses: ./.github/workflows/reusable_publish_changelog.yml