cmd/containerboot,kube: enable autoadvertisement of Tailscale services on containerboot (#18527)

* cmd/containerboot,kube/services: support the ability to automatically advertise services on startup

Updates #17769

Signed-off-by: chaosinthecrd <tom@tmlabs.co.uk>

* cmd/containerboot: don't assume we want to use kube state store if in kubernetes

Fixes #8188

Signed-off-by: chaosinthecrd <tom@tmlabs.co.uk>

---------

Signed-off-by: chaosinthecrd <tom@tmlabs.co.uk>

cmd/k8s-operator/sts.go

@@ -692,6 +692,10 @@ func (a *tailscaleSTSReconciler) reconcileSTS(ctx context.Context, logger *zap.S
 			Name:  "TS_KUBE_SECRET",
 			Value: "$(POD_NAME)",
 		},
+		corev1.EnvVar{
+			Name:  "TS_EXPERIMENTAL_SERVICE_AUTO_ADVERTISEMENT",
+			Value: "false",
+		},
 		corev1.EnvVar{
 			Name:  "TS_EXPERIMENTAL_VERSIONED_CONFIG_DIR",
 			Value: "/etc/tsconfig/$(POD_NAME)",