never login with key env

[castorinop]

bad path for tailscale client.

fix proposed: #52

[mikejobson]

Also experiencing issues with this not logging in with the key.

I'm also not able to automatically sign in the the key

[GarrisonD]

Faced it today with this dead simple DevContainer config:

{
  "name": "codespaces-tailscale-test",
  "image": "mcr.microsoft.com/vscode/devcontainers/universal:latest",
  "features": { "ghcr.io/tailscale/codespace/tailscale:latest": {} }
}

$ sudo tailscale status
Logged out.

The auth key secret get injected properly:

$ echo $TS_AUTH_KEY 
tskey-auth-xxx

@raggi Could you take a look? 🙏