625 user control over pod labels

[Pinolo]

Changes

• Allows passing labels from ClusterBuildStrategy, BuildStrategy, Build, BuildRun, on to TaskRun and its pod
• Overlapping labels in "lower" levels override "upper" levels
• Some labels prefixes are reserved, i.e. not propagated

Fixes #625

Submitter Checklist

• [x] Includes tests if functionality changed/was added
• [x] Includes docs if changes are user-facing
• [x] Set a kind label on this PR
• [x] Release notes block has been filled in, or marked NONE

Release Notes

• Developers and admins are now able to set labels in ClusterBuildStrategy, BuildStrategy, Build, BuildRun, that will be propagated to the pods running Tekton pipelines
• Overlapping labels in "lower" levels override "upper" levels, i.e. if you set the same label key in both BuildStrategy resource and Build resource, the one in Build resource will be used
• Reserved label key prefixes:
  • k8s.io
  • kubernetes.io
  • tekton.dev
  • shipwright.io

Developers and admins are now able to set labels in ClusterBuildStrategy, BuildStrategy, Build, BuildRun, that will be propagated to the pods running Tekton pipelines. Some reserved label key prefixes will not propagate:
- k8s.io
- kubernetes.io
- tekton.dev
- shipwright.io

[openshift-ci[bot]]

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[Pinolo]

/kind feature