RabbitMQ Python Kombu message retry

Based on this article.

1. Build RabbitMQ:

$ docker build -t rabbitmq-delay .

2. Start RabbitMQ:

$ docker run -d -p 5672:5672 -p 15672:15672 --hostname my-rabbit --name some-rabbit rabbitmq-delay

3. Install kombu:

$ pip3 install kombu