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/proxygroup_specs.go

@@ -173,6 +173,10 @@ func pgStatefulSet(pg *tsapi.ProxyGroup, namespace, image, tsFirewallMode string
 				Name:  "TS_KUBE_SECRET",
 				Value: "$(POD_NAME)",
 			},
+			{
+				Name:  "TS_EXPERIMENTAL_SERVICE_AUTO_ADVERTISEMENT",
+				Value: "false",
+			},
 			{
 				// TODO(tomhjp): This is tsrecorder-specific and does nothing. Delete.
 				Name:  "TS_STATE",