chore: change env IMAGE to KNP_IMAGE for build image.

[liangyuanpeng]

releated #70

#19 ERROR: failed to push gcr.io/k8s-staging-test-infra/gcb-docker-gcloud:v20240718-5ef92b5c36: failed to authorize: failed to fetch oauth token: unexpected status from GET request to https://gcr.io/v2/token?scope=repository%3Ak8s-staging-test-infra%2Fgcb-docker-gcloud%3Apull%2Cpush&service=gcr.io: 403 Forbidden

stil failing post the build image, the reason is there is an IMG gcr.io/k8s-staging-test-infra/gcb-docker-gcloud:v20240718-5ef92b5c36 environment variable by default. This causes kube-network-policies to be pushed to the wrong image repository when building the image.

kube-network-policies$ docker inspect gcr.io/k8s-staging-test-infra/gcb-docker-gcloud:v20240718-5ef92b5c36|grep IMAGE
                "IMAGE=gcr.io/k8s-staging-test-infra/gcb-docker-gcloud:v20240718-5ef92b5c36",

see https://github.com/kubernetes/test-infra/blob/c3c3ae29e0eca28eb4349a99d5605beb0103f1b7/images/gcb-docker-gcloud/Dockerfile#L24

so this PR is working for change the environment IMAGE to KNP_IMAGE, i think it can resolve it. But if there is any way to use prowjob to test ahead of time based on this PR, that would be great

[k8s-ci-robot]

Hi @liangyuanpeng. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[liangyuanpeng]

question: do we need to get gcloud auth for docker image here?, just like gcloud auth configure-docker

cc @ameukam , thank you!

see https://github.com/kubernetes-sigs/kwok/blob/2033297e7e4bb3068b1d8ef4d240f9decab0663c/cloudbuild.yaml#L23

[aojea]

/ok-to-test

[aojea]

/lgtm
/approve

Let's iterate

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aojea, liangyuanpeng

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