add cloudflare's argo tunnel

[balupton]

unfortunately, it is not available for arm64/aarch64 yet

https://community.cloudflare.com/t/request-for-arm64-architecture-binary/16687?u=balupton

perhaps installing it via go get instead of rpm would be an option

[balupton]

now that https://www.boundaryproject.io is a thing, this is probably not necessary, as argo tunnel has been swallowed into cloudflare one, which is pricey

[balupton]

closing in favour of boundary: #14

[balupton]

actually, boundary and cloudflared are a bit different - boundary is about accessing the machine, whereas cloudflared is still a way of securing the machine's internet connection