Provide starter workflows to Custom GitHub Actions Workflows in GitHub Pages

Custom GitHub Actions Workflows were just announced.

As of the announcement, Next.js, Hugo, Gatsby, Jekyll, and NuxtJS are the first starter workflows available at https://github.com/actions/starter-workflows/tree/main/pages.

https://github.blog/changelog/2022-07-27-github-pages-custom-github-actions-workflows-beta/

I would be happy if custom GitHub Actions workflow for Middleman is provided in that repository, somewhere else (or this repository).