Change signature on pr.GetOwnerReference()

[jlpettersson]

Changes

A small refactoring of PipelineRun function. Change signature so it corresponds with the name.
From:

func (pr *PipelineRun) GetOwnerReference() []metav1.OwnerReference

To:

func (pr *PipelineRun) GetOwnerReference() metav1.OwnerReference

This signature change leads to more idiomatic code and avoids code like:

 pr.GetOwnerReference()[0]

to be replaced with:

 pr.GetOwnerReference()

This is a small Go function API change, but it does not change the type structure API (e.g. Yaml). Code that before this change used

 pr.GetOwnerReference()

need to change the function call to

 []metav1.OwnerReference{pr.GetOwnerReference()}

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Reviewer Notes

If API changes are included, additive changes must be approved by at least two OWNERS and backwards incompatible changes must be approved by more than 50% of the OWNERS, and they must first be added in a backwards compatible way.

Release Notes

- Signature on public function is changed: `func (pr *PipelineRun) GetOwnerReference() []metav1.OwnerReference` is changed to `func (pr *PipelineRun) GetOwnerReference() metav1.OwnerReference`

[tekton-robot]

Hi @jlpettersson. Thanks for your PR.

I'm waiting for a tektoncd member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[dibyom]

/ok-to-test

[tekton-robot]

The following is the coverage report on pkg/.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/pipeline/v1alpha1/pipelinerun_types.go	90.9%	88.5%	-2.4
pkg/apis/pipeline/v1beta1/pipelinerun_types.go	87.1%	85.7%	-1.4

[afrittoli]

I agree that the [0] is not nice, there's no semantic attached to that.
/lgtm

[vdemeester]

/lgtm

[tekton-robot]

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