Errors deploying gh-pages branch

[sitestudio]

Steps to get to this point:

1. Fork the repo
2. Choose to deploy from gh-pages branch via Actions
3. Change publish-on-checkin.yml to point to node 16 and v3 actions
4. Add a dummy file called /templates/default.json to get past the build failing on that file missing
5. Pulled down code, build and ran designer, made a basic change and saved it (change was to add text)
6. Push changes back up to the repo and then the pipeline attempts to build and deploy

Getting the following error (happens even before steps 5 and 6 above):

Push the commit or tag
/usr/bin/git push origin gh-pages
remote: Permission to QED-DeveloperPortal/API-Portal.git denied to github-actions[bot].
fatal: unable to access 'https://github.com/QED-DeveloperPortal/API-Portal.git/': The requested URL returned error: 403
Error: Action failed with "The process '/usr/bin/git' failed with exit code 128"

[sitestudio]

Managed to get it all working by messing around with various things including the check-in yaml.