App Suggestion: [OpenFaaS]
Serverless Functions, Made Simple. OpenFaaS® makes it simple to deploy both functions and existing code to Kubernetes
Link: https://www.openfaas.com/
I'm not sure it's possible with Docker, but you have something as faasd.

Caprover is a utility for Docker Swarm. Since this product is depreciated for Docker Swarm environments, it seems pointless to try and make it work.
Looked like a promising solution for self-hosted "serverless functions" though. Just means switching to OpenShift or Kubernetes to use it.
Seems they got it wrong as they don't understand the difference between Docker Swarm and Swarm Mode. This was something I warned others about way back in 2016, the use of these naming conventions is going to lead to serious confusion and here we are with other projects dropping support because of that confusion.
People don't seem to be aware of the Moby project, which is the ecosystem that is forked from the Docker ecosystem.
See: https://mobyproject.org/