envknob/featureknob: restore SSH and exit-node capability for Home Assistant (#16263)

SSH was disabled in #10538
Exit node was disabled in #13726
This enables ssh and exit-node options in case of Home Assistant.

Fixes #15552

Signed-off-by: Laszlo Magyar <lmagyar1973@gmail.com>

envknob/featureknob/featureknob.go

@@ -10,7 +10,6 @@ import (
 	"runtime"
 
 	"tailscale.com/envknob"
-	"tailscale.com/hostinfo"
 	"tailscale.com/version"
 	"tailscale.com/version/distro"
 )
@@ -26,14 +25,6 @@ func CanRunTailscaleSSH() error {
 		if distro.Get() == distro.QNAP && !envknob.UseWIPCode() {
 			return errors.New("The Tailscale SSH server does not run on QNAP.")
 		}
-
-		// Setting SSH on Home Assistant causes trouble on startup
-		// (since the flag is not being passed to `tailscale up`).
-		// Although Tailscale SSH does work here,
-		// it's not terribly useful since it's running in a separate container.
-		if hostinfo.GetEnvType() == hostinfo.HomeAssistantAddOn {
-			return errors.New("The Tailscale SSH server does not run on HomeAssistant.")
-		}
 		// otherwise okay
 	case "darwin":
 		// okay only in tailscaled mode for now.
@@ -58,10 +49,5 @@ func CanUseExitNode() error {
 		distro.QNAP:
 		return errors.New("Tailscale exit nodes cannot be used on " + string(dist))
 	}
-
-	if hostinfo.GetEnvType() == hostinfo.HomeAssistantAddOn {
-		return errors.New("Tailscale exit nodes cannot be used on HomeAssistant.")
-	}
-
 	return nil
 }