releng: Update cross image presubmit to push to the correct staging project

[cpanato]

as discussed here: kubernetes/k8s.io#1772 we should try to push the image to the project that is running on.
Later I will check about the --local flag

/assign @spiffxp @justaugustus

[justaugustus]

@cpanato -- Let's mimic the post-submit here:

test-infra/config/jobs/image-pushing/releng/k8s-staging-build-image.yaml

Lines 113 to 138 in ff6abef

	- name: post-release-push-image-kube-cross
	cluster: k8s-infra-prow-build-trusted
	annotations:
	testgrid-dashboards: sig-release-releng-informing, sig-release-master-informing, sig-release-image-pushes
	testgrid-alert-email: [email protected]
	decorate: true
	run_if_changed: '^images\/build\/cross\/'
	branches:
	- ^master$
	spec:
	serviceAccountName: gcb-builder
	containers:
	- image: gcr.io/k8s-testimages/image-builder:v20210302-aa40187
	command:
	- /run.sh
	args:
	- --project=k8s-staging-build-image
	- --scratch-bucket=gs://k8s-staging-build-image-gcb
	- --build-dir=.
	- images/build/cross
	env:
	- name: LOG_TO_STDOUT
	value: "y"
	rerun_auth_config:
	github_team_ids:
	- 2241179 # release-managers

Namely: use the --project flag to set the project, instead of env vars

[justaugustus]

Errr, nevermind. I see it's set further up in the config.

/retitle releng: Update cross image presubmit to push to the correct staging project
/lgtm

[hasheddan]

/lgtm

[k8s-ci-robot]

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[cpanato]

the --project does not set the registry variable

[k8s-ci-robot]

@cpanato: Updated the job-config configmap in namespace default at cluster test-infra-trusted using the following files:

• key release-config.yaml using file config/jobs/kubernetes/release/release-config.yaml

In response to this:

as discussed here: kubernetes/k8s.io#1772 we should try to push the image to the project that is running on.
Later I will check about the --local flag

/assign @spiffxp @justaugustus

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[justaugustus]

the --project does not set the registry variable

Yep, see my second review: #21307 (review)