rules:
  - id: missing-no-install-recommends
    patterns:
      - pattern: |
          RUN apt-get install ...
      - pattern-not:
          RUN apt-get install ... --no-install-recommends ...
    languages: [dockerfile]
    message: >-
      This 'apt-get install' is missing '--no-install-recommends'. This prevents
      unnecessary packages from being installed, thereby reducing image size. Add
      '--no-install-recommends'.
    severity: INFO
    metadata:
      source-rule-url: https://github.com/hadolint/hadolint/wiki/DL3015
      references:
        - https://github.com/hadolint/hadolint/wiki/DL3015
      category: best-practice
      technology:
        - dockerfile