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"
```