Copy serviceAccountName to affinity-assistant

[ewolak-sq]

Resolves #3748

Changes

When a serviceAccountName is specified on a PipelineRun, all Pods that
execute the constituent Tasks run with the specified ServiceAccount. If
an Affinity Assistant pod is launched, it should also run with the same
ServiceAccount. This ensures that cluster policies apply consistently to
Tekton-launched Pods, and it avoids use of the "default" ServiceAccount
that is discouraged by some Kubernetes security experts.

/kind bug

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Release Notes

bugfix: serviceAccountName from PipelineRun now applied to affinity-assistant pod

[linux-foundation-easycla]

• ❌ - Eric Wolak (Square) The commit (5d30456) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

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[tekton-robot]

Hi @ewolak-sq. 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[ghost]

/ok-to-test

[tekton-robot]

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

File	Old Coverage	New Coverage	Delta
pkg/reconciler/pipelinerun/affinity_assistant.go	92.3%	92.7%	0.4

[ghost]

/test tekton-pipeline-unit-tests

[afrittoli]

/test check-pr-has-kind-label

[tekton-robot]

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

File	Old Coverage	New Coverage	Delta
pkg/reconciler/pipelinerun/affinity_assistant.go	92.3%	92.7%	0.4

[tekton-robot]

@ewolak-sq: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-tekton-pipeline-integration-tests	5d30456	link	/test pull-tekton-pipeline-integration-tests

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[tekton-robot]

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Mark the issue as fresh with /remove-lifecycle stale with a justification.
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If this issue is safe to close now please do so with /close with a justification.
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/lifecycle stale

Send feedback to tektoncd/plumbing.

[tekton-robot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten with a justification.
Rotten issues close after an additional 30d of inactivity.
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/lifecycle rotten

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