images/gcb-docker-gcloud: use docker buildx v0.6.0

[spiffxp]

Hoping this addresses #20884

According to the upstream issue(s) this should include the fix we're looking for

[k8s-ci-robot]

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[spiffxp]

Rolling this out everywhere is going to be fun, so I'd like to make sure I can attempt a repro before trying to do so

$ curl -s -X POST \
  -F "q=gcr.io/k8s-testimages/gcb-docker-gcloud" \
  -F "repos=*"   \
  -F "excludeFiles=vendor/"\
  "https://cs.k8s.io/api/v1/search" \
  | jq -r '.Results | to_entries | map(.key as $key | .value.Matches | map("\($key)/\(.Filename)")) | flatten | map("- \(.)")[]'

• kubernetes-csi/csi-driver-host-path/release-tools/cloudbuild.yaml
• kubernetes-csi/csi-driver-iscsi/release-tools/cloudbuild.yaml
• kubernetes-csi/csi-driver-nfs/release-tools/cloudbuild.yaml
• kubernetes-csi/csi-lib-utils/release-tools/cloudbuild.yaml
• kubernetes-csi/csi-proxy/cloudbuild.yaml
• kubernetes-csi/csi-proxy/release-tools/cloudbuild.yaml
• kubernetes-csi/csi-release-tools/cloudbuild.yaml
• kubernetes-csi/csi-test/release-tools/cloudbuild.yaml
• kubernetes-csi/external-attacher/release-tools/cloudbuild.yaml
• kubernetes-csi/external-health-monitor/release-tools/cloudbuild.yaml
• kubernetes-csi/external-provisioner/release-tools/cloudbuild.yaml
• kubernetes-csi/external-resizer/release-tools/cloudbuild.yaml
• kubernetes-csi/external-snapshotter/release-tools/cloudbuild.yaml
• kubernetes-csi/livenessprobe/release-tools/cloudbuild.yaml
• kubernetes-csi/node-driver-registrar/release-tools/cloudbuild.yaml
• kubernetes-csi/volume-data-source-validator/release-tools/cloudbuild.yaml
• kubernetes-sigs/apiserver-network-proxy/cloudbuild.yaml
• kubernetes-sigs/aws-ebs-csi-driver/cloudbuild.yaml
• kubernetes-sigs/boskos/images/cloudbuild.yaml
• kubernetes-sigs/cloud-provider-azure/cloudbuild.yaml
• kubernetes-sigs/cluster-api/cloudbuild-nightly.yaml
• kubernetes-sigs/cluster-api/cloudbuild.yaml
• kubernetes-sigs/cluster-api/docs/book/src/developer/providers/v1alpha3-to-v1alpha4.md
• kubernetes-sigs/cluster-api-bootstrap-provider-kubeadm/cloudbuild.yaml
• kubernetes-sigs/cluster-api-provider-aws/cloudbuild-nightly.yaml
• kubernetes-sigs/cluster-api-provider-aws/cloudbuild.yaml
• kubernetes-sigs/cluster-api-provider-azure/cloudbuild.yaml
• kubernetes-sigs/cluster-api-provider-digitalocean/cloudbuild.yaml
• kubernetes-sigs/cluster-api-provider-gcp/cloudbuild.yaml
• kubernetes-sigs/cluster-api-provider-openstack/cloudbuild-nightly.yaml
• kubernetes-sigs/cluster-api-provider-openstack/cloudbuild.yaml
• kubernetes-sigs/cri-tools/images/cloudbuild.yaml
• kubernetes-sigs/descheduler/cloudbuild.yaml
• kubernetes-sigs/external-dns/cloudbuild.yaml
• kubernetes-sigs/gateway-api/cloudbuild.yaml
• kubernetes-sigs/gcp-compute-persistent-disk-csi-driver/cloudbuild.yaml
• kubernetes-sigs/gcp-compute-persistent-disk-csi-driver/release-tools/cloudbuild.yaml
• kubernetes-sigs/gcp-filestore-csi-driver/cloudbuild.yaml
• kubernetes-sigs/gluster-file-external-provisioner/release-tools/cloudbuild.yaml
• kubernetes-sigs/image-builder/cloudbuild.yaml
• kubernetes-sigs/ingress-controller-conformance/cloudbuild.yaml
• kubernetes-sigs/ingress-controller-conformance/images/echoserver/cloudbuild.yaml
• kubernetes-sigs/ingress-controller-conformance/images/reports/cloudbuild.yaml
• kubernetes-sigs/kube-storage-version-migrator/cloudbuild.yaml
• kubernetes-sigs/metrics-server/cloudbuild.yaml
• kubernetes-sigs/nfs-ganesha-server-and-external-provisioner/release-tools/cloudbuild.yaml
• kubernetes-sigs/nfs-subdir-external-provisioner/release-tools/cloudbuild.yaml
• kubernetes-sigs/node-feature-discovery/cloudbuild.yaml
• kubernetes-sigs/node-feature-discovery-operator/cloudbuild.yaml
• kubernetes-sigs/prometheus-adapter/cloudbuild.yaml
• kubernetes-sigs/scheduler-plugins/cloudbuild.yaml
• kubernetes-sigs/secrets-store-csi-driver/docker/cloudbuild.yaml
• kubernetes-sigs/security-profiles-operator/cloudbuild.yaml
• kubernetes-sigs/sig-storage-local-static-provisioner/cloudbuild.yaml
• kubernetes/dns/cloudbuild.yaml
• kubernetes/ingress-nginx/cloudbuild.yaml
• kubernetes/ingress-nginx/images/cfssl/cloudbuild.yaml
• kubernetes/ingress-nginx/images/echo/cloudbuild.yaml
• kubernetes/ingress-nginx/images/fastcgi-helloserver/cloudbuild.yaml
• kubernetes/ingress-nginx/images/httpbin/cloudbuild.yaml
• kubernetes/ingress-nginx/images/nginx/cloudbuild.yaml
• kubernetes/ingress-nginx/images/test-runner/cloudbuild.yaml
• kubernetes/kops/cloudbuild.yaml
• kubernetes/kube-state-metrics/cloudbuild.yaml
• kubernetes/kubernetes/build/pause/cloudbuild.yaml
• kubernetes/kubernetes/cluster/images/etcd/cloudbuild.yaml
• kubernetes/kubernetes/test/images/cloudbuild.yaml
• kubernetes/release/cmd/krel/cmd/testdata/changelog-v1.18.0-alpha.3/GetPullRequest-158.json
• kubernetes/release/cmd/vulndash/cloudbuild.yaml
• kubernetes/release/images/build/cross/cloudbuild.yaml
• kubernetes/release/images/build/debian-base/cloudbuild.yaml
• kubernetes/release/images/build/debian-iptables/cloudbuild.yaml
• kubernetes/release/images/build/go-runner/cloudbuild.yaml
• kubernetes/release/images/build/setcap/cloudbuild.yaml
• kubernetes/release/images/releng/k8s-ci-builder/cloudbuild.yaml
• kubernetes/test-infra/config/jobs/image-pushing/README.md
• kubernetes/test-infra/images/alpine/cloudbuild.yaml
• kubernetes/test-infra/images/git/cloudbuild.yaml
• kubernetes/website/cloudbuild.yaml

[spiffxp]

/cc @claudiubelu @aojea

[aojea]

/lgtm
🤞