Fixing "Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?" on AWS CodeBuild with a custom docker image

buildspec.yml

version: 0.2

phases:
  install:
    commands:
      - nohup /usr/local/bin/dockerd --host=unix:///var/run/docker.sock --host=tcp://127.0.0.1:2375 --storage-driver=overlay2 &
      # If the base operating system is Alpine Linux, in the buildspec.yml add the -t argument to timeout:
      - timeout 15 sh -c "until docker info; do echo .; sleep 1; done"
  pre_build:
    commands:
      - docker build -t helloworld .
  build:
    commands:
      - docker images
      - docker run helloworld echo "Hello, World!"