Update kanban.yml

Signed-off-by: sashashura <93376818+sashashura@users.noreply.github.com>

.github/workflows/kanban.yml

@@ -2,11 +2,15 @@ name: Kanban management
 on:
   pull_request_target:
     types: [opened, reopened]
+permissions:
+  contents: read
 env:
   MY_GITHUB_TOKEN: ${{ secrets.KANBAN_TOKEN }}
 
 jobs:
   assign_one_project:
+    permissions:
+      repository-projects: write  # for srggrs/assign-one-project-github-action to assign issues and PRs to repo project
     name: Add new pull requests to the kanban
     if: github.repository_owner == 'consul'
     runs-on: ubuntu-latest