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Docker builds/commands not working?

Using the demo setup of this project, I'm unable to do anything with docker inside my builds. Using the following .gitlab-ci.yml:

image: docker:latest

stages:
  - build
  
build:
  stage: build
  script:
    - docker images

I get the following error:

$ docker images
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
ERROR: Job failed: error executing remote command: command terminated with non-zero exit code: Error executing in Docker Container: 1

From the video of your demo (https://www.youtube.com/watch?v=3A8mdJl_icM) I got no clues on how you use docker in your build. Somehow you got a magic command which you tell build and deploy in your .gitlab-ci.yml, but no further clues.

Are you using docker-in-docker, or docker socket? How do you expose the docker socker in containers running in kubernetes? What am I missing? I purely followed the steps in the README.md, deployed to a Kubernetes cluster in GCloud.