Set "matrix-synapse-admin" to `synapse_admin_identifier`

Signed-off-by: Suguru Hirahara <did🔑z6MkvVZk1A3KBApWJXv2Ju4H14ErDfRGxh8zxdXSZ4vACDg5>

docs/configuring-playbook-synapse-admin.md

@@ -88,6 +88,6 @@ To use Synapse Admin, you need to have [registered at least one administrator ac
 
 ## Troubleshooting
 
-As with all other services, you can find the logs in [systemd-journald](https://www.freedesktop.org/software/systemd/man/systemd-journald.service.html) by logging in to the server with SSH and running `journalctl -fu synapse-admin`.
+As with all other services, you can find the logs in [systemd-journald](https://www.freedesktop.org/software/systemd/man/systemd-journald.service.html) by logging in to the server with SSH and running `journalctl -fu matrix-synapse-admin`.
 
 If you have questions, you can join this community room and feel free to ask: [#synapse-admin:etke.cc](https://matrix.to/#/#synapse-admin:etke.cc)

group_vars/matrix_servers

@@ -855,7 +855,7 @@ devture_systemd_service_manager_services_list_auto: |
     }] if matrix_synapse_auto_compressor_enabled else [])
     +
     ([{
-      'name': 'synapse-admin.service',
+      'name': (synapse_admin_identifier + '.service'),
       'priority': 4000,
       'restart_necessary': (synapse_admin_restart_necessary | bool),
       'groups': ['matrix', 'synapse-admin'],
@@ -4997,6 +4997,8 @@ matrix_synapse_reverse_proxy_companion_access_log_syslog_integration_server_port
 
 synapse_admin_enabled: false
 
+synapse_admin_identifier: matrix-synapse-admin
+
 synapse_admin_docker_image_registry_prefix_upstream: "{{ matrix_container_global_registry_prefix_override if matrix_container_global_registry_prefix_override else synapse_admin_docker_image_registry_prefix_upstream_default }}"
 
 synapse_admin_container_uid: "{{ matrix_user_uid }}"