Deploy AnyCable with Capistrano and systemd

AnyCable brings performance, stability, and scalability to WebSockets in Ruby/Rails. For some reason, it lacks only one thing – deployment documentation.We primary use AWS as an infrastructure solution and happy with it. Capistrano gives us power tool to run deploy scripts while AWS allows scaling fast and easy (yes, we don't need Docker :)). Every day we manage Unicorn, Puma, Sidekiq with custom Capistrano recipes and have no problem with it. Everything works smooth and seems right. With AnyCable you cannot use Capistrano so easy because AnyCable cannot be daemonized out of the box. I will run ahead and say that this was a starting point for a solid, unified deploy solution.