per-namespace WorkflowDefaults

[Justin-DynamicD]

Summary

What change needs making?

As of v2.9, there is the ability to override the default artifact repository on a per-namespace basis by supplying a ConfigMap in said namespace with the appropriate label. However, it only works explicitly for setting the default-artifact-repository.

This request is to expend this feature for workflowDefaults.

When would you use this?

This would be particularly valuable in multi-tenancy environments were tenants may be assigned their own namespace for executing workflows. This would allow setting default annotations, labels, service account, etc. at the namespace level, allowing tenants to make smaller, more DRY workflows.

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