docs/examples: Tailscale installation on Ubuntu; requires apt-key add

[vielmetti]

Motivation: one of the first things I do when setting up a new node is put it on my Tailscale private network. comtrya should make this very easy, at the minimum by installing the necessary binaries, and (ideally) by propagating the necessary secrets or documenting the auth steps needed to turn up the network.

The Tailscale docs here https://tailscale.com/download/linux show the steps, which include downloading a signing key and adding a repository; the signing key in particular may require some updates to the Aptitude libraries to interface to apt-key add.

[vielmetti]

My workaround version of this is a script at https://github.com/vielmetti/vielmetti-shelltools/blob/master/files/bin/setup-tailscale-ubuntu-focal which I install with a file.copy command and then run with sh -x. I do need to cut and paste a URL into my browser on my laptop to authenticate. Much faster and less error-prone that following the instructions by hand.

[rawkode]

This is currently available in a PR: #138

[icepuma]

This issue is resolved?

[rawkode]

Yep, #138 was merged. Thanks