@thomas thank you Thomas. I know.
What you may not know:
Ghostโs recommended setup for self-hosting had been Ubuntu / MySQL for 3+ years. YunoHost runs on Debian - with a MariaDB database for its Ghost package.
These standards have been abandoned by Ghost 2+ YEARS ago. A kind YunoHost volunteer has been manually patching packages after each new release.
Now Ghost is recommending Docker for v6 and going forward.
I LOOOOOVE YunoHost but I would not recommend it for self-hosting Ghost.