References:
- https://habr.com/ru/company/tinkoff/blog/490656/
- https://github.com/camunda/docker-camunda-bpm-platform/blob/next/README.md
- https://camunda.com/blog/2015/08/start-and-complete-process-with-rest-api/
- https://docs.camunda.org/manual/latest/user-guide/process-engine/external-tasks/
- https://docs.camunda.org/javadoc/camunda-bpm-platform/7.8/index.html?org/camunda/bpm/engine/ExternalTaskService.html
- https://forum.camunda.io/t/external-task-polling-failed-with-engineerror/27890/5
- https://docs.camunda.org/manual/7.11/reference/rest/deployment/