Commits on Jun 6, 2023

1. TEP-0135: Refactor Affinity Assistant PVC creation …

   Part of [tektoncd#6740][tektoncd#6740]. [TEP-0135][tep-0135] introduces a feature that allows a cluster operator
   to ensure that all of a PipelineRun's pods are scheduled to the same node.
   
   Before this commit, the PipelineRun reconciler creates PVC for each `VolumeClaimTemplate` backed workspace,
   and mount the PVCs to the AA to avoid PV availability zone conflict.
   This implementation works for `AffinityAssistantPerWorkspace` but introduces availability zone conflict
   issue in the `AffinityAssistantPerPipelineRun` mode since we cannot enforce all the PVC are created in the same availability zone.
   
   Instead of directly creating a PVC for each PipelineRun workspace backed by a VolumeClaimTemplate,
   this commit sets one VolumeClaimTemplate per PVC workspace in the affinity assistant StatefulSet spec,
   which enforces all VolumeClaimTemplates in StatefulSets are all provisioned on the same node/availability zone.
   
   This commit just refactors the current implementation in favor of the `AffinityAssistantPerPipelineRun` feature.
   There is no functionality change. The `AffinityAssistantPerPipelineRun` feature will be added in the follow up PRs.
   
   [tektoncd#6740]: tektoncd#6740
   [tep-0135]: https://github.com/tektoncd/community/blob/main/teps/0135-coscheduling-pipelinerun-pods.md

   

   QuanZhang-William committed Jun 6, 2023
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