You folks are spot on. Single file in this case means single binary that is statically liked, i.e. w/o dependencies on shared library allowing you to just copy it from machine to machine similar to e.g. k3s.

Whether to use docker or not is really up to you. It's just a way to deploy other assets, e.g. a static html bundle. More importantly it saves me the trouble of providing windows builds at this current time :)