Description of problem:

Pipeline builder UI fails to save buildah task with default BUILD_ARGS parameter

Workaround:

This issue can be worked around via removing the element, making the value an empty array - but the UI does not indicate that this needs to be done.

Prerequisites (if any, like setup, operators/versions):

OpenShift Pipelines operator

Steps to Reproduce

1. Navigate to the OpenShift Pipelines Operator pipeline builder in the OpenShift console.
2. Add the buildah task to a new pipeline.
3. Observe the BUILD_ARGS parameter in the side panel. Note that its default value is [""] (a single element with an empty string).
4. Do not modify this parameter.
5. Attempt to save the pipeline by clicking the "Create" button.

Actual Results:

The UI displays a validation error and prevents the pipeline from being saved.

Expected results:

The pipeline should be created successfully, as the buildah task can run without issue with the default [""] value for the BUILD_ARGS parameter.

Reproducibility (Always/Intermittent/Only Once):

Always