Description of problem:

The new Buildah task differs from the deprecated Buildah ClusterTask

Workaround: NA

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

Tekton Pipelines version 1.17 or newer.

Steps to Reproduce

• Define a Tekton PipelineRun or TaskRun using the new Buildah task.

• In the params section of the task, specify BUILD_EXTRA_ARGS using a multi-line YAML string with backslashes ({}) and newlines to separate arguments.

- name: BUILD_EXTRA_ARGS
  value: |
    --volume $(workspaces.source.path):$(workspaces.source.path) \
    --build-arg="UBI_VERSION=$(cat $(workspaces.source.path)/packer/UBI_VERSION)" \
    --build-arg="SSM_VERSION=$(cat $(workspaces.source.path)/packer/SSM_VERSION)"

• Execute the PipelineRun or TaskRun.

Actual results:

The task fails with the error message: Error: accepts at most 1 arg(s), received X. The entire multi-line value is treated as a single argument, which is invalid for the buildah bud command.

Expected results:

The new Buildah task should support all valid formats from the deprecated Buildah ClusterTask, including multi-line arguments separated by a backslash and a newline. The arguments should be correctly parsed and passed to the buildah bud command.

Reproducibility (Always/Intermittent/Only Once):

Always