use_mr_plan error when overriding plan job.

In the CI Lint web tool I receive the error jobs plan config should implement the script:, run:, or trigger: keyword.

This occurs when I attempt to override the job plan:before_script when using the sample .gitlab-ci.yml from the @timofurrer example repo:

plan:
  before_script:
    - apk add --no-cache aws-cli

Removing the plan job override results in a successful validation.

Disabling the use_mr_plan input option also results in a successful validation.

What should I be doing to correctly include the additional tools to the image?

Edited by Jason Kalawe