WS-677: Multi-stage workflow research & development

Nathan Hertzrequested to merge
WS-677-dag-support-for-workflows into main

Changes

  • Updated workflow_service to handle DAG submission
  • Added new three-stage DAG-ified null_dag workflow and templates

Testing

  • Unit tests are written and pass
  • Submitting normal jobs still works
  • Submitting DAGs works

Completes WS-677

Edited by Nathan Hertz

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