slapos_web_deploy: run the ORS playbook under flock

master/bt5/slapos_web_deploy/PathTemplateItem/web_page_module/deploy_ors.txt

@@ -15,4 +15,5 @@ ${slapos_install_content}
 clear
 
 echo "Starting Ansible playbook:"
-ansible-playbook ors.yml -i hosts --connection=local
+mkdir -p /opt/upgrader
\ No newline at end of file
+flock -n /opt/upgrader/ansible.lock -c "ansible-playbook ors.yml -i hosts --connection=local"