fix a bug in gcb-docker-gcloud image

[upodroid]

/cc @BenTheElder

[upodroid]

Verified the fix locally:

 mahamed  Mac  ~  Desktop  …  test-infra  images  gcb-docker-gcloud   fix-gcb-docker-image  1✎  2+  1  $  docker run --privileged -it --rm -v /var/run/docker.sock:/var/run/docker.sock -v ~/.config/gcloud:/r
oot/.config/gcloud gcr.io/k8s-staging-test-infra/gcb-docker-gcloud:latest
WARNING: The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested
ec974638aefa:/workspace# docker pull alpine:3.22
3.22: Pulling from library/alpine
Digest: sha256:4b7ce07002c69e8f3d704a9c5d6fd3053be500b7f1c69fc0d80990c2ad8dd412
Status: Downloaded newer image for alpine:3.22
docker.io/library/alpine:3.22
ec974638aefa:/workspace# docker tag alpine:3.22 gcr.io/k8s-infra-e2e-boskos-004/alpine:3.22
ec974638aefa:/workspace# docker push gcr.io/k8s-infra-e2e-boskos-004/alpine:3.22
The push refers to repository [gcr.io/k8s-infra-e2e-boskos-004/alpine]
6b59a28fa201: Pushed 
3.22: digest: sha256:24bb3511a0db7b5114a4aee033c65a8a4148f39b7b80a398e548546db967a36f size: 1025

i Info → Not all multiplatform-content is present and only the available single-platform image was pushed
         sha256:4b7ce07002c69e8f3d704a9c5d6fd3053be500b7f1c69fc0d80990c2ad8dd412 -> sha256:24bb3511a0db7b5114a4aee033c65a8a4148f39b7b80a398e548546db967a36f

[BenTheElder]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BenTheElder, upodroid

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• OWNERS [BenTheElder,upodroid]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[BenTheElder]

someday we're going to have fun tracking down the hardcoded regions but that's NOT new to this PR :-)

thanks!