failures for Duplicates main to old master branch

https://github.com/android/wear-os-samples/actions/workflows/copy-branch.yml

```
remote: Permission to android/wear-os-samples.git denied to github-actions[bot].
fatal: unable to access 'https://github.com/android/wear-os-samples/': The requested URL returned error: 403
```

Start with the copy-branch.yml workflow linked in the issue and inspect the step that duplicates main to the old master branch. Reproduce or trace the github-actions[bot] 403 permission failure, then verify that the workflow completes the branch copy without the reported access error.

Written by the indexing model from the issue text.