merge: #10670

10670: Use PAT as checkout token in backport-action workflow r=korthout a=korthout

## Description

<!-- Please explain the changes you made here. -->

In order to allow the backport-action to backport accepted changes to workflows, we need to provide the `workflow` permission to the token used in the git checkout.

The PAT used as `github_token` has this permission. By using the same PAT as the github_token, we also make sure that the git commits are no longer produced by `github-action` but by `backport-action` itself.

For more details, see: https://github.com/orgs/community/discussions/27072#discussioncomment-3254515

## Related issues

<!-- Which issues are closed by this PR or are related -->

relates to #10666



Co-authored-by: Nico Korthout <korthout@users.noreply.github.com>

.github/workflows/backport.yml

@@ -23,6 +23,9 @@ jobs:
       )
     steps:
       - uses: actions/checkout@v3
+        with:
+          # Token for git actions, e.g. git push
+          token: ${{ secrets.BACKPORT_ACTION_PAT }}
       - name: Create backport PRs
         uses: zeebe-io/backport-action@v0.0.8
         with: