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Discontinued Caddy-SSH is a general-purpose, extensible, modular, memory-safe SSH server built in Go [Moved to: https://github.com/kadeessh/kadeessh]
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You can do this with Caddy too, FYI: https://github.com/lucaslorentz/caddy-docker-proxy
See the article linked in OP for example, Caddy at its core is actually just config management and runtime platform where just about any kind of app can be built on top. It just happens to ship with state of the art HTTP and TLS apps. Third party plugins can add even more, like https://github.com/mohammed90/caddy-ssh which is a fully featured SSH server. And this can all run from a single binary, using Go's concurrency model.