gsoc26: Declarative Workflow Engine (chaining download, deploy, delete)

[DhanashreePetare]

Pull Request

Description

Adds a declarative workflow engine: databusclient workflow run pipeline.yml runs a sequence of download/deploy/delete steps defined in YAML, with output chaining between steps (${steps.name.output_files} / ${steps.name.output_urls}) and per-step error handling (fail/continue/retry).

Related Issues
Issue #79

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• This change requires a documentation update
• Housekeeping

Checklist:

• My code follows the ruff code style of this project.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
  • poetry run pytest - all tests passed
  • poetry run ruff check - no linting errors

One open design question raised with mentor separately: deploying a file that was downloaded and converted (--format/--compression) during a workflow step has no clean path yet, since the converted file only exists locally and deploy needs a fetchable URL. Deploying the original, unconverted download URL (via the new output_urls step output) works today and is tested.

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