v4 of action can no longer find Poetry after installation

[luketainton]

After the release of v4 my flows can no longer find Poetry:

creating virtual environment...
creating shared libraries...
upgrading shared libraries...
installing poetry...
⚠️  Note: '/root/.local/bin' is not on your PATH environment variable. These
    apps will not be globally accessible until your PATH is updated. Run `pipx
    ensurepath` to automatically add it, or manually modify your PATH in your
    shell's config file (i.e. ~/.bashrc).
done! ✨ 🌟 ✨
  installed package poetry 1.8.5, installed using Python 3.10.1[2](https://git.tainton.uk/public/webexmemebot/actions/runs/87#jobstep-4-2)
  These apps are now globally available
    - poetry

/var/run/act/workflow/4: line 2: poetry: command not found

I think to fix this we should still run pipx ensurepath.

(Running this in self-hosted Gitea Actions but it works just the same as GitHub Actions)