fix: export all Argo manifests (cron workflow, sensor) in --only-json

[npow]

Summary

• argo-workflows create --only-json now exports all Argo manifests, not just the WorkflowTemplate
• Output is a JSON object with up to three keys: workflow_template (always), cron_workflow (when @schedule is used), and sensor (when @trigger/@trigger_on_finish is used)
• Previously the CronWorkflow and Sensor configs were silently dropped
• _cron_workflow_json() now mirrors ARGO_WORKFLOWS_USE_SCHEDULES — uses "schedules": [...] (list) when the flag is True, matching what ArgoClient.schedule_workflow_template actually deploys

Fixes #1730, fixes #1940.

⚠️ Breaking change: output format

The output of --only-json has changed from a bare WorkflowTemplate JSON object to a wrapper envelope:

Before:

{"apiVersion": "argoproj.io/v1alpha1", "kind": "WorkflowTemplate", ...}

After:

{"workflow_template": {...}, "cron_workflow": {...}}

If you have scripts parsing the old output, update them to add .workflow_template:

# old
python flow.py argo-workflows create --only-json | jq '.spec.templates'

# new
python flow.py argo-workflows create --only-json | jq '.workflow_template.spec.templates'

Test plan

• Added test/ux/core/test_argo_manifests.py with tests for all manifest export scenarios
• Added mock.patch tests for both ARGO_WORKFLOWS_USE_SCHEDULES=True and False paths in TestCronWorkflowJson

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

This PR expands Argo --only-json output to include all generated manifests. The main changes are:

• Adds CronWorkflow JSON export alongside the WorkflowTemplate.
• Adds Sensor JSON export when trigger manifests are present.
• Switches the CLI output to a wrapper object with manifest-specific keys.
• Adds tests for plain, scheduled, triggered, and combined manifest export cases.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issue tied to the prior review threads remains in the changed code.
• The CronWorkflow schedule field now follows the same config switch as the deployment path.

Important Files Changed

Filename	Overview
metaflow/plugins/argo/argo_workflows.py	Adds helpers to export WorkflowTemplate, CronWorkflow, and Sensor manifests as one JSON object.
metaflow/plugins/argo/argo_workflows_cli.py	Updates --only-json to print the combined manifest export while preserving deployer metadata.
test/ux/core/test_argo_manifests.py	Adds coverage for the new manifest wrapper shape and CronWorkflow schedule field variants.

_{Reviews (5): Last reviewed commit: "fix: mirror ARGO_WORKFLOWS_USE_SCHEDULES..." | Re-trigger Greptile}

[dallinstevens]

@npow This is exactly what my team needs with our implementation of metaflow/argocd. Anything we can do to help get this over the line? Happy to carry it forward: rebase on master, get CI green, add tests while keeping your authorship to this if you're open to it.