I agree that they are orthogonal but I'm not convinced that they are the right tool for the job. They can do all sorts of things above and beyond what is needed. Those capabilities come at a cost. For instance, they also manage things like ensuring that servers are running and other transient state.

In addition -- I'd consider the "rerun the config tool on a pre-existing container" to be an anti-pattern. This creates more and more layers to the Docker file that have to be downloaded every time that container is run. I'd much rather build each container from a bedrock up with well versioned dependencies (not as easy as it should be with many package managers).