Mount Google Voice configuration read-only

roles/custom/matrix-bridge-mautrix-gvoice/templates/systemd/matrix-mautrix-gvoice.service.j2

@@ -23,7 +23,7 @@ ExecStartPre={{ devture_systemd_docker_base_host_command_docker }} create \
 			--user={{ matrix_user_uid }}:{{ matrix_user_gid }} \
 			--cap-drop=ALL \
 			--network={{ matrix_bridge_mautrix_gvoice_container_network }} \
-			--mount type=bind,src={{ matrix_bridge_mautrix_gvoice_config_path }},dst=/config \
+			--mount type=bind,src={{ matrix_bridge_mautrix_gvoice_config_path }},dst=/config,ro \
 			--mount type=bind,src={{ matrix_bridge_mautrix_gvoice_data_path }},dst=/data \
 			--label-file={{ matrix_bridge_mautrix_gvoice_base_path }}/labels \
 			--workdir=/data \