Follow-up from "Move artifact reports from yaml reference to job artifacts doc"

The following discussions from !30465 (merged) should be addressed:

• @eread started a discussion:

  From a purely aesthetic point of view, I think having this as a sub section of: http://docs-preview-ee-30465.178.62.207.141.nip.io/ee/ci/pipelines/job_artifacts.html#defining-artifacts-in-gitlab-ciyml would make sense, it's all about YAML configuration.

  We can leave for a follow up.

• @eread started a discussion:

  There are a couple of limitations on top of the [original dotenv rules](https://github.com/motdotla/dotenv#rules).

• @eread started a discussion:

  - The size of the dotenv file must be smaller than 5 kilobytes.
  - The number of variables must be less than 10.
  - It does not support variable substitution in the dotenv file itself.
  - It does not support empty lines and comments (`#`) in dotenv file.
  - It does not support quote escape, spaces in a quote, a new line expansion in a quote,
    in dotenv file.

• @eread started a discussion:

  dotenv