ci: use MAINTAINER_TOKEN for ff-merge push

Author: rpcme

.github/workflows/ff-merge.yml

@@ -22,6 +22,7 @@ jobs:
         path: meta-aws-demos
         submodules: true
         fetch-depth: 0
+        token: ${{ secrets.MAINTAINER_TOKEN }}
 
     - name: merge ${{ github.event.inputs.branch }}-next into ${{ github.event.inputs.branch }}
       working-directory: meta-aws-demos
@@ -38,4 +39,3 @@ jobs:
         BRANCH_NAME: ${{ github.event.inputs.branch }}
       run: |
         git push -u origin ${BRANCH_NAME}
-