gitlab: a job without 'script' (trigger job) is demoted to an unparseable top-level block

[jccguimaraes]

A job is recognised only if its body has a script key:

if jobMap, ok := toStringAnyMap(doc[key]); ok {
    if _, hasScript := jobMap["script"]; hasScript {

A trigger job has no script — that is what makes it a trigger job. It falls through to the generic top-level branch, which warns and writes the map as a bare block named after the key:

build:
  script: [make]
deploy:
  trigger:
    include:
      - local: .gitlab/child.yml
    strategy: depend
  rules:
    - if: '$CI_COMMIT_BRANCH == "main"'
      when: manual

unparse:

warning: unsupported top-level key 'deploy' passed through

deploy {
  rules = [{ ... }]
  trigger {
    include  = [{ local = ".gitlab/child.yml" }]
    strategy = "depend"
  }
}

parse: Blocks of type "deploy" are not expected here.

The job is silently demoted and the file it produces does not parse. hclJobBlock already has a Trigger field, so the block shape is supported — only the detection is wrong.

Jobs with no script are ordinary GitLab: trigger jobs, and jobs that inherit script through extends. Detection should be "a top-level map that is not a reserved key and is not hidden (.-prefixed)" rather than "has a script". validatePipeline already enforces that a non-template job has a script somewhere in its chain, so the check does not need to live in the writer.