Remove the volumes definition when there is no volume.

templates/shinyproxy-docker-compose.yml.j2

@@ -43,6 +43,7 @@ services:
 {% endif %}
 {% endif %}
 {% endif %}
+{% if shinyproxy_docker_privileged_user or shinyproxy_docker_mount_conf_file %}
     volumes:
 {% if shinyproxy_docker_privileged_user %}
       - /var/run/docker.sock:/var/run/docker.sock
@@ -50,6 +51,7 @@ services:
 {% if shinyproxy_docker_mount_conf_file %}
       - {{ shinyproxy_as_docker_src_dir }}/application.yml:{{ shinyproxy_conf_dir }}/application.yml
 {% endif %}
+{% endif %}
 {% if not shinyproxy_docker_mount_conf_file %}
     secrets:
       - source: {{ shinyproxy_as_docker_stack_name }}_{{ shinyproxy_as_docker_service_name }}