fn push

$ fn push

DEVELOPMENT COMMANDS
  fn push -   Push function to docker registry
              
USAGE
  fn [global options] push [command options] 
    
DESCRIPTION
  This command pushes the created image to the Docker registry.
    
COMMAND OPTIONS
  --verbose, -v                   Verbose mode
  --registry --registry username  Set the Docker owner for images and optionally the registry. This will be prefixed to your function name for pushing to Docker registries.
 eg: --registry username will set your Docker Hub owner. `--registry registry.hub.docker.com/username` will set the registry and owner.
  

Some link