TEP-0056: Pipelines in Pipelines. Execution status for Finally Tasks.

[twoGiants]

Feature request

Expose the execution status of child Pipelines so it can be consumed in Finally Tasks via $(tasks.<name>.status). Currently, execution status is not produced for PipelineTasks using pipelineRef or pipelineSpec.

This includes:

• Produce execution status (Succeeded, Failed, etc.) for child Pipeline PipelineTasks
• Enable $(tasks.<name>.status) references in Finally Tasks for child Pipeline PipelineTasks
• Update docs/pipelines-in-pipelines.md known limitations section and documentation

See TEP-0056: Execution Status.

Use case

A parent Pipeline runs a security-scanning child Pipeline and sends a notification in a Finally Task with the outcome:

tasks:
  - name: security-scans
    pipelineRef:
      name: security-scans
finally:
  - name: notification
    params:
      - name: status
        value: $(tasks.security-scans.status)
    taskRef:
      name: send-notification