Summary

Add --ignore-missing option on argo lint to allow users to ignore errors depending on other resources.

Use Cases

In some use cases, for example when lint is used with --offline option, we cannot necessarily guarantee that all dependent resources are available in the same directory/repository. Imagine there are some centralized repository where manages commonly used Cluster Workflow Template and each individual Workflow definitions are managed in a separate place. For those scenarios, it is expected to receive couldn't find cluster workflow template ** error on every execution.

This change allows users to catch grammatical mistakes, while ignoring expected errors for undefined references.

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