Consolidate the three main branch component pipelines (hypershift-operator, control-plane-operator, hypershift-shared-ingress) into a single shared pipeline to eliminate duplication and simplify maintenance.

Changes

Pipeline Consolidation

• Create shared pipeline at .tekton/pipelines/common-operator-build.yaml
• Migrate all 6 main branch PipelineRuns to use pipelineRef with git resolver
• Reduces code duplication by ~3,500 lines across 6 PipelineRun files

Parameter Cleanup

Remove 7 unused parameters from consolidated pipeline:

• build-args (never referenced)
• build-args-file (hardcoded to "")
• build-image-index (hardcoded to "true")
• build-source-image (hardcoded to "false")
• privileged-nested (hardcoded to "false")
• rebuild (hardcoded to "false")
• skip-checks (hardcoded to "false" - always run security checks)

Remove obsolete hermetic parameter from 4 PipelineRuns (HERMETIC is now hardcoded to "true" in pipeline tasks)

Reduce pipeline parameters from 16 to 9 essential parameters.

Benefits

• Single source of truth for Tekton task versions
• Easier to update pipeline behavior across all components
• Cleaner parameter surface with only essential configuration exposed
• All builds are hermetic and security checks always run

Files Changed

• .tekton/pipelines/common-operator-build.yaml (new)
• .tekton/control-plane-operator-main-pull-request.yaml
• .tekton/control-plane-operator-main-push.yaml
• .tekton/hypershift-operator-main-pull-request.yaml
• .tekton/hypershift-operator-main-push.yaml
• .tekton/hypershift-shared-ingress-main-pull-request.yaml
• .tekton/hypershift-shared-ingress-main-push.yaml