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codequality: make our dependency on jq < 182MiB

Our .gitlab-ci.yml has this job:

codequality:
  <<: *except-docs
  <<: *pull-cache
  stage: test
  image: docker:latest
  # ...
  script:
    - ./scripts/codequality analyze -f json > raw_codeclimate.json || true
    # The following line keeps only the fields used in the MR widget, reducing the JSON artifact size
    - cat raw_codeclimate.json | docker run -i stedolan/jq -c 'map({check_name,description,fingerprint,location})' > codeclimate.json
  artifacts:
    paths: [codeclimate.json]
    expire_in: 1 week

That second script link jq is a 24KiB binary. We're downloading a 182MiB docker image to run it. And since this is dind, I believe we're doing that every single time.

A few alternatives:

  • We could remove the jq dependency by including a small script for whatever interpreters the docker:latest image includes
  • We could build a custom image off docker:latest that comes with jq installed
  • We could switch to an image that contains jq but is "only" 12MiB, e.g. https://hub.docker.com/r/pinterb/jq/