Improve test environment setup

[eddiebrissow]

Improve containers, add Redis and MongoDB dependencies.
Integration tests:
das-query-engine test environment
https://github.com/singnet/das-query-engine/blob/master/compose_das_alpine.yaml

Unit Tests:

As a suggestion, create a docker-compose to wrap the environment and dependencies.
quick eg:

services:
  redis:
    image: redis:latest
    container_name: redis
    
  mongo:
    image: mongo:latest
    container_name: mongo
    environment:
      MONGO_INITDB_ROOT_USERNAME: dbadmin
      MONGO_INITDB_ROOT_PASSWORD: dassecret

  das-attention-broker:
    build:
      context: docker
    container_name: das-attention-broker-build
    depends_on:
      - redis
      - mongo
    volumes:
      - .:/opt/das-attention-broker 
    command: ../scripts/bazel_test.sh

    working_dir: /opt/das-attention-broker/src  

To run
docker compose up