adding verification-mode field back to pipelines spec to unblock the upgrade failure

[jkandasa]

Changes

verification-mode removed on part of #1481, but it was there in previous releases, which leads the following issue in webhook,

{"level":"info","logger":"tekton-operator-webhook","caller":"webhook/admission.go:151","msg":"remote admission controller audit annotations=map[string]string(nil)","commit":"8e8c163","knative.dev/kind":"operator.tekton.dev/v1alpha1, Kind=TektonConfig","knative.dev/namespace":"","knative.dev/name":"config","knative.dev/operation":"UPDATE","knative.dev/resource":"operator.tekton.dev/v1alpha1, Resource=tektonconfigs","knative.dev/subresource":"","knative.dev/userinfo":"system:serviceaccount:openshift-operators:openshift-pipelines-operator","admissionreview/uid":"958be8bd-9d63-4b95-aa7d-9285684ff86c","admissionreview/allowed":false,"admissionreview/result":"&Status{ListMeta:ListMeta{SelfLink:,ResourceVersion:,Continue:,RemainingItemCount:nil,},Status:Failure,Message:mutation failed: cannot decode incoming old object: json: unknown field \"verification-mode\",Reason:BadRequest,Details:nil,Code:400,}"}

To unblock the upgrade, I am adding back. I have created an issue to remove verification-mode field => #1497

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Release Notes

NONE

[khrm]

/lgtm

[tekton-robot]

@khrm: changing LGTM is restricted to collaborators

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/lgtm

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[jkandasa]

/cc @concaf

[jkandasa]

/cc @PuneetPunamiya

[tekton-robot]

@jkandasa: GitHub didn't allow me to request PR reviews from the following users: PuneetPunamiya.

Note that only tektoncd members and repo collaborators can review this PR, and authors cannot review their own PRs.

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/cc @PuneetPunamiya

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[piyush-garg]

/approve

[tekton-robot]

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

File	Old Coverage	New Coverage	Delta
pkg/apis/operator/v1alpha1/tektonpipeline_defaults.go	90.6%	90.7%	0.2

[PuneetPunamiya]

LGTM

[vdemeester]

/lgtm

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: khrm, piyush-garg, vdemeester

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[piyush-garg]

/lgtm

[piyush-garg]

/cherry-pick v0.67.0

[tekton-robot]

@piyush-garg: once the present PR merges, I will cherry-pick it on top of v0.67.0 in a new PR and assign it to you.

In response to this:

/cherry-pick v0.67.0

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[tekton-robot]

@piyush-garg: cannot checkout v0.67.0: error checking out v0.67.0: exit status 1. output: error: pathspec 'v0.67.0' did not match any file(s) known to git

In response to this:

/cherry-pick v0.67.0

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[jkandasa]

/cherry-pick release-v0.67.x

[tekton-robot]

@jkandasa: new pull request created: #1502

In response to this:

/cherry-pick release-v0.67.x

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