Deploying more stacks

Let's deploy another stack.

This time we'll use Docker stack defined in the Compose file docker-compose-stack.yml (https://github.com/vfarcic/go-demo/blob/master/docker-compose-stack.yml) located in the vfarcic/go-demo (https://github.com/vfarcic/go-demo/) repository. It is as follows:

version: '3'

services:

  main:
    image: vfarcic/go-demo
    environment:
      - DB=db
    networks:
      - proxy
      - default
    deploy:
      replicas: 3
      labels:
        - com.df.notify=true
        - com.df.distribute=true
        - com.df.servicePath=/demo
        - com.df.port=8080

  db:
    image: mongo
    networks:
      - default

networks:
  default:
    external: false
  proxy:
    external: true

The stack defines two services (main and db). They will communicate with each other through the default network that will be created automatically by the stack (no need for docker network...