As of v5.21, Ghost is no longer compatible with MariaDB and will not run with SQLite in production mode - it will only run with MySQL v8 or higher.
If you have an existing Ghost app, do not attempt to upgrade it beyond v5.20 - if you do, the site will continue to work, but you will be unable to list posts in your admin site.
Because of this situation we've decided to temporarily remove Ghost from our officially supported apps.
We hope to have a new Ghost installer in the future, but for now we'll create a new tutorial to show how to install MySQL and Ghost together manually. We should have that posted here in the forum soon.
We will, of course, continue to provide support for the Ghost apps you've already installed and will help you if you have problems with a self-installed app.