This amends commit b7e48058c8d243adf1ff687e3e92d3fb02b035ea.
That commit broke all documented ways of starting Tailscale on gokrazy:
https://gokrazy.org/packages/tailscale/ — both Option A (tailscale up)
and Option B (tailscale up --auth-key) rely on the tailscale CLI working.
I verified that the tailscale CLI just prints it help when started
without arguments, i.e. it does not stay running and is not restarted.
I verified that the tailscale CLI successfully exits when started with
tailscale up --auth-key, regardless of whether the node has joined
the tailnet yet or not.
I verified that the tailscale CLI successfully waits and exits when
started with tailscale up, as expected.
fixes https://github.com/gokrazy/gokrazy/issues/286
Signed-off-by: Michael Stapelberg <michael@stapelberg.de>