Running a container with the Docker blueprint (deprecated) in Multipass

My Ghost container starts, then immediately stops with this error:

[2023-04-26 09:09:45] INFO Ghost is running in production...
[2023-04-26 09:09:45] INFO Your site is now available on http://localhost:2368/
[2023-04-26 09:09:45] INFO Ctrl+C to shut down
[2023-04-26 09:09:45] INFO Ghost server started in 1.151s
[2023-04-26 09:09:45] ERROR connect ECONNREFUSED 127.0.0.1:3306
connect ECONNREFUSED 127.0.0.1:3306
"Unknown database error"
Error ID:
    500
Error Code:
    ECONNREFUSED

I did get an Apache httpd container running ok though.