Add ko version instead of using latest

[mbpavan]

Changes

Multi arch builds are failing with the below error.
go: github.com/google/ko@latest: github.com/google/ko@v0.18.1 requires go >= 1.25.0 (running go 1.24.1; GOTOOLCHAIN=local)

hence adding ko version explicitly

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Release Notes

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[mbpavan]

/retest

[jkhelil]

/approve

[anithapriyanatarajan]

@mbpavan Instead of pinning the version of ko can we update the ci workflow to use the installed ko version - by replacing https://github.com/tektoncd/operator/blob/main/.github/workflows/ci.yaml#L144-L145 with

  # Kubernetes
  KO_DOCKER_REPO=example.com \
  kustomize build --load-restrictor LoadRestrictionsNone config/kubernetes/overlays/default | \
  ko resolve --push=false --platform=all \
    --oci-layout-path=.bin/oci -f -

  # OpenShift
  KO_DOCKER_REPO=example.com \
  kustomize build --load-restrictor LoadRestrictionsNone config/openshift/overlays/default | \
  ko resolve --push=false --platform=all \
    --oci-layout-path=.bin/oci -f -
    
This way we do not fix the ko version to an older version. The the ci workflow uses the version of ko installed in the previous step rather than building one more time?

[jkhelil]

/approve cancel

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[anithapriyanatarajan]

@mbpavan @jkhelil - Thanks for the discussion. I shall mark this PR on hold. In any case we need to fix the make file so that make apply for contributors works smooth while the CI will be fixed with a separate PR that decouples ci workflow from leveraging the make resolve

[anithapriyanatarajan]

/hold