Switch all remaining container volume mounting from -v to --mount

`--mount` is safer, as `-v` has the side-effect of creating the "source"
destination as a directory if it doesn't exist yet.
We don't need such magic.

roles/custom/matrix-prometheus-nginxlog-exporter/templates/systemd/matrix-prometheus-nginxlog-exporter.service.j2

@@ -29,7 +29,7 @@ ExecStart={{ devture_systemd_docker_base_host_command_docker }} run --rm --name
 			{% if matrix_prometheus_nginxlog_exporter_container_syslog_host_bind_port %}
 			-p {{ matrix_prometheus_nginxlog_exporter_container_syslog_host_bind_port }}:{{ matrix_prometheus_nginxlog_exporter_container_syslog_port }}/udp \
 			{% endif %}
-			-v {{ matrix_prometheus_nginxlog_exporter_config_path }}:/etc/prometheus-nginxlog-exporter:z \
+			--mount type=bind,{{ matrix_prometheus_nginxlog_exporter_config_path }},dst=/etc/prometheus-nginxlog-exporter \
 			{% for arg in matrix_prometheus_nginxlog_exporter_container_extra_arguments %}
 			{{ arg }} \
 			{% endfor %}