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Gitlab CI/CD pipeline has big support for all times of automation. Having switched from Github Actions to Gitlab due to having all stuff at one place, I had made a good choice. Recently I compiled a Nodejs app which had so many external packages. This lead to 22 minute average Gitlab runner time. I was going out of free 400 minutes per month.

Now lets see how its done.

docker pull $CI_REGISTRY_IMAGE:latest || true

Now lets build the image using same tag.

docker build --cache-from $CI_REGISTRY_IMAGE:latest --tag $CI_REGISTRY_IMAGE:latest .

Push the image.

docker push $CI_REGISTRY_IMAGE:latest-sias

In this job stage I am using docker:19.03.12 image.

Use this example:

build docker:
  image: docker:19.03.12
  stage: build
  services:
    - docker:19.03.12-dind
  before_script:
    - echo "$CI_REGISTRY_PASSWORD" | docker login -u "$CI_REGISTRY_USER" "$CI_REGISTRY" --password-stdin
  script:
    - docker pull $CI_REGISTRY_IMAGE:latest || true
    - docker build
        --cache-from $CI_REGISTRY_IMAGE:latest
        --tag $CI_REGISTRY_IMAGE:latest
        .
    - docker push $CI_REGISTRY_IMAGE:latest