Add `tls-v1-3` subdomain.

[c0r0n3r]

This adds tls-v1-3 on port 1013, similar to how other protocol subdomains are implemented. Also adds the test to the dashboard.

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[lgarron]

If I recall correctly, we were using a version of nginx that doesn't support TLS 1.3. Have you been able to test this change using Docker?

[hellow554]

If I recall correctly, we were using a version of nginx that doesn't support TLS 1.3.

That's unfortunately correct. Version 1.10.3 is used, 1.13 is needed atleast.

Is there a reason not to update to the latest stable version 1.20? It's not available in the default repo, but in the nginx repo. Maybe worth an update?

Maybe worth an update of the whole ubuntu from 16.04 to 20.04?

[onefreddy]

I join the topic, I think you need to quickly refresh your nginx. I would like to see a working subdomain in the mode tls 1.3 only