[tor-relays] Launching a Tor relay with Docker in seconds (x86-64, armhf, arm64)

[x9p]

> Hi all,
>
> This is my humble contribution. There are prebuilt images for launching
> Tor
> relays for x86-64, armhf and arm64 architectures in seconds. The repo

Congratulations, to test it is in my todo list. Such addition can be
really useful.

x9p