GitHub Actions sync failure #23

https://github.com/embulk/embulk-output-jdbc/actions/runs/10614122306

```
Run git push origin master:main
remote: Permission to embulk/embulk-output-jdbc.git denied to github-actions[bot].
fatal: unable to access 'https://github.com/embulk/embulk-output-jdbc/': The requested URL returned error: 403
Error: Process completed with exit code 128.
```

https://github.com/embulk/embulk-output-jdbc/actions/runs/10614122306/job/29429177763#step:4:7

```
Run git push origin master:main
git push origin master:main
shell: /usr/bin/bash -e {0}
remote: Permission to embulk/embulk-output-jdbc.git denied to github-actions[bot].
fatal: unable to access 'https://github.com/embulk/embulk-output-jdbc/': The requested URL returned error: 403
Error: Process completed with exit code 128.
```

Start with the linked GitHub Actions run and its failing `git push origin master:main` step. Inspect the workflow configuration responsible for the sync, then verify that the action can complete the push without the reported 403 permission error.

Written by the indexing model from the issue text.