scripts/installer.sh: add tuxedoOS to the Ubuntu copies

[Nathanwoodburn]

This allows users on TuxedoOS to be able to use the script to install tailscale automatically

[danderson]

Thanks!

[danderson]

Oh, we need a Signed-Off-By line in your commit message, to satisfy the DCO policy. You can do that with git commit --amend -s, which will add the signoff to your commit message, assuming you agree with https://developercertificate.org/ of course.

[danderson]

switching to "change requested" to avoid accidental merge in the meantime.

[Nathanwoodburn]

G'day,
I've added a signed-of message to my commit

[danderson]

Thanks again!