service: Allow specifying container hostname

roles/service/tasks/main.yaml

@@ -44,6 +44,7 @@
     container_devices: "{{ service_container_devices }}"
     container_publish_ports: "{{ _service_container_publish_ports }}"
     container_networks: "{{ _service_container_networks }}"
+    container_hostname: "{{ service_container_hostname }}"
     container_secrets: "{{ _service_container_secrets }}"
     container_env: "{{ service_container_env }}"
     container_add_capabilities: "{{ service_container_add_capabilities }}"