Automatic deployment to GitHub Pages does not seem to be working

See here for a failed run: https://github.com/MetaMask/phishing-warning/actions/runs/16997261413/job/48192649473

If this run expires, the error was:

```
> Run peaceiris/actions-gh-pages@4f9cc6602d3f66b9c108549d475ec49e8ef4d45e
[INFO] Usage https://github.com/peaceiris/actions-gh-pages#readme
Dump inputs
Setup auth token
Error: Action failed with "not found deploy key or tokens"
```

Start with the failed workflow run and the deployment step using peaceiris/actions-gh-pages. Inspect the workflow's deployment credentials and permissions against the action's documented requirements. Done means the workflow completes successfully and publishes the site to GitHub Pages.

Written by the indexing model from the issue text.