Stop CI persistent ref creation behind flag

Hordur Freyr Yngvasonrequested to merge
feature/stop-ci-persistent-ref-creation into master

What does this MR do and why?

Stops creating CI persistent refs during pipeline start and job run transitions when stop_ci_persistent_ref_creation is enabled.

Adds stop_ci_persistent_ref_creation_override as a project-level opt-out to re-enable persistent ref creation for known projects during rollout.

No changelog because the behavior is behind default-disabled feature flags.

References

Screenshots or screen recordings

Not applicable. Backend-only change.

How to set up and validate locally

  1. Create a pipeline with the feature flag disabled:

    Feature.disable(:stop_ci_persistent_ref_creation)
project = Project.find_by_full_path('<project-full-path>')
pipeline = Ci::CreatePipelineService.new(project, project.first_owner, ref: project.default_branch).execute.payload

  2. Verify the pipeline persistent ref exists:

    pipeline.persistent_ref.exist?

  3. Enable the feature flag and create another pipeline:

    Feature.enable(:stop_ci_persistent_ref_creation, project)
pipeline = Ci::CreatePipelineService.new(project, project.first_owner, ref: project.default_branch).execute.payload

  4. Verify the pipeline persistent ref is not created:

    pipeline.persistent_ref.exist?

  5. Enable the override flag and create another pipeline:

    Feature.enable(:stop_ci_persistent_ref_creation_override, project)
pipeline = Ci::CreatePipelineService.new(project, project.first_owner, ref: project.default_branch).execute.payload

  6. Verify the pipeline persistent ref exists again:

    pipeline.persistent_ref.exist?

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