service: Have service depend on oauth2-proxy socat socket if set

roles/service/vars/main/general.yaml

@@ -11,6 +11,7 @@ _service_container_wants: >-
   {{
     service_wants
     + ([service_name + '-socat.socket'] if service_container_http_port > 0 else [])
+    + ([service_name + '-oauth2-proxy-socat.socket'] if _service_oauth2_proxy else [])
     + _service_additional_containers
         | map(attribute='name')
         | map('regex_replace', '$', '.service')