GitLab CI: pass artifacts via environment variables

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First, a little more convenient way to pass data between stages without having to read/source artifact files.

job1:
  artifacts:    
    variables:
    - SOME_RESULT
  script:
    - export SOME_RESULT="hello world"

job2:
  script:
  - echo $SOME_RESULT  # prints: hello world

Second, and foremost, an extremely convenient way for all-dynamic variable substitution.

job1:
  artifacts:
    variables:
    - IMAGE_TAG
  script:
    - export IMAGE_TAG="docker tag name dynamically generated"

job2:
  image: company/project:$IMAGE_TAG
  script:
  - # do whatever

Whether it's part of "artifacts", or named differently, it doesn't matter. However, naming it "artifacts" would imply similar behavior - e.g. an artifact variable won't be passed if it's not listed as a dependency (when dependencies are defined).

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Edited by 🤖 GitLab Bot 🤖