service: Support connecting containers to tailscale network

roles/service/vars/main/additional.yaml

@@ -1,6 +1,7 @@
 ---
 _service_additional_container_defaults:
   image: "{{ service_container_image }}"
+  tailscale: false
   requires: []
   wants: []
 

roles/service/vars/main/general.yaml

@@ -1,5 +1,5 @@
 ---
-_service_container_networks: >-
+_service_networks: >-
   {{
     [{
       'name': service_name,
@@ -21,6 +21,10 @@ _service_container_networks: >-
       )
     ) | map('community.general.dict_kv', 'name')
   }}
+_service_container_networks: >-
+  {{
+    [{'name': service_name ~ '-tailscale.container'}] if service_tailscale else _service_networks
+  }}
 _service_static_ip: "{{ service_container_ip | length > 0 }}"
 
 _service_container_requires: >-