feat(helm): configurable replicas (webhook + operator) and extraObjects

[aqeelat]

Changes

Feature additions to the community Helm chart (charts/tekton-operator/). Each is a separate commit for independent review/cherry-pick. Split out from the bug-fix PR #3661 to keep review focused.

1. feat(helm): make webhook Deployment replicas configurable, floored at 1

The webhook Deployment hardcoded replicas: 1. Expose it via webhook.replicas (default 1), guarded with max 1 so an explicit 0 renders 1. A webhook scaled to 0 has no endpoints, so admission calls time out; under failurePolicy: Fail this wedges operations on the matched CRs.

2. feat(helm): add extraObjects for user-supplied manifests

Render arbitrary manifests from values.extraObjects (standard pattern, e.g. argoproj/argo-cd). Useful for resources the chart deliberately does not template, most notably a TektonConfig CR. Defaults to [] (renders nothing).

3. feat(helm): make operator Deployment replicas configurable

The operator Deployment hardcoded replicas: 1. Expose it via operator.replicas (default 1). Unlike the webhook, scaling up is safe here: the operator runs on knative sharedmain, which enables leader election by default (WithHADisabled is never called), so >=2 replicas run active/standby — no duplicate writes. A config-leader-election ConfigMap is optional; knative falls back to defaults when it is absent.

Submitter Checklist

• Run make test lint before submitting a PR
  (chart-only change; make lint / make test cover Go packages and do not exercise the chart. Verified with helm lint / helm template. Note: full-chart templating also requires the CRD parse fix from fix(helm): correct logging CM, add webhook replicas, add extraObjects #3661, which is a pre-existing bug on main.)
• Includes tests
  (No chart test framework exists in this repo. Validation is via helm lint / helm template rendering.)
• Includes docs (if user facing)
  (values.yaml comments document all new values, including the leader-election note on operator.replicas and the autoInstallComponents warning on extraObjects.)
• Commit messages follow commit message best practices

Release Notes

The webhook Deployment replica count is now configurable via
webhook.replicas (default 1, floored at 1 to avoid wedging admission).

The operator Deployment replica count is now configurable via
operator.replicas (default 1). Leader election is active by default, so
>=2 runs active/standby.

A new extraObjects value allows rendering arbitrary Kubernetes manifests
alongside the operator (e.g. a TektonConfig CR).

[tekton-robot]

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