Which in this case would make things a little more difficult cause Ghost uses SQLite and Dokku can't deploy apps which use it because of default Node.js Heroku buildpack which prohibits SQLite usage. You can patch a buildpack though.

For example in my fork of Dokku I replaced Heroku buildpacks with plain Dockerfiles to define both a stack and a runtime dependencies — https://github.com/andreypopp/upaas