Make route advertising configurable

nodes/_defaults.yaml

@@ -21,6 +21,7 @@ dns:
 ntp: nl.pool.ntp.org
 install: true
 autoInstall: false
+advertiseRoutes: true
 patches:
   - !patch hostname
   - !patch install-disk

patches/tailscale.yaml

@@ -3,5 +3,7 @@ kind: ExtensionServiceConfig
 name: tailscale
 environment:
   - TS_AUTHKEY={{ config.tailscale.authKey }}
-  - TS_EXTRA_ARGS=--login-server {{ config.tailscale.loginServer }}
+  - TS_EXTRA_ARGS=--login-server {{ config.tailscale.loginServer }} --advertise-tags "tag:cluster-{{ node.cluster.name }}"
+  {% if node.advertiseRoutes %}
   - TS_ROUTES={{ helper.tailscale_subnet(node.gateway, node.netmask) }}
+  {% endif %}