docker compose use cache from image code example

Example: docker compose use cache from image

# _config-examples/multi-stage/.gitlab-ci.yml

image: docker:stable
services:
  - docker:dind


variables:
  DOCKER_DRIVER: overlay2
  CACHE_IMAGE: mjhea0/docker-ci-cache
  DOCKER_BUILDKIT: 1

stages:
  - build

docker-build:
  stage: build
  before_script:
    - docker login -u $REGISTRY_USER -p $REGISTRY_PASS
  script:
    - docker build
        --target base
        --cache-from $CACHE_IMAGE:base
        --tag $CACHE_IMAGE:base
        --file ./Dockerfile.multi
        --build-arg BUILDKIT_INLINE_CACHE=1
        "."
    - docker build
        --cache-from $CACHE_IMAGE:base
        --cache-from $CACHE_IMAGE:stage
        --tag $CACHE_IMAGE:stage
        --file ./Dockerfile.multi
        --build-arg BUILDKIT_INLINE_CACHE=1
        "."
  after_script:
    - docker push $CACHE_IMAGE:stage