TinaCMS-based Cloudron app now exists, but a quick note on positioning: TinaCMS is not an out-of-the-box full-featured CMS. It needs configuring, and Tina themselves mainly document it around content-model/schema setup plus general site configuration.
What I’ve built is about 90% TinaCMS, but configured as a generic, customizable brochure-website editor aimed at non-technical users, rather than e.g. a docs site or an e-commerce site.
The implementation is quite opinionated, so it may not suit everyone’s preferences or use case.
I’m not releasing it as a Community App for general use yet, as I want more testing and a few more tweaks first. That said, if someone has a strong use case and genuine interest, I can make it available on request.