Add no update flag as our config is read only

roles/matrix-bot-maubot/templates/systemd/matrix-bot-maubot.service.j2

@@ -31,7 +31,7 @@ ExecStart={{ matrix_host_command_docker }} run --rm --name matrix-bot-maubot \
 			-p {{ matrix_bot_maubot_management_interface_http_bind_port }}:{{ matrix_bot_maubot_management_interface_port }}
 			{% endif %}
 			{{ matrix_bot_maubot_docker_image }} \
- 			python3 -m maubot -c /config/config.yaml
+ 			python3 -m maubot -c /config/config.yaml --no-update
 
 ExecStop=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} kill matrix-bot-maubot 2>/dev/null || true'
 ExecStop=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} rm matrix-bot-maubot 2>/dev/null || true'