my impression is that while there are supportive noises and nice features (e.g. actors) from the swift language team around server-side swift, that there are no serious Apple efforts to support it.
Exploratory efforts by Google around data science, and IBM for enterprise back-end have been abandoned. As such, outside of a few enthusiastic people who like the language, there isn't much of a server-side community which will make it hard to find good packages.