enable docker-in-docker for cloud-provider-gcp tasks.

[jiahuif]

k/cloud-provider-gcp is switching to docker from Bazel to build container images, as a step of producing the final tarballs.

This PR enables docker-in-docker (dind for short) for all tasks that invokes building, so that docker can be used for building container image.

Note: this change will NOT break current configuration.

[jiahuif]

/remove-area provider/aws
/area provider/gcp

[k8s-ci-robot]

@jiahuif: Those labels are not set on the issue: area/provider/was

In response to this:

/remove-area provider/was
/area provider/gcp

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[jiahuif]

/remove-area provider/aws

[jiahuif]

/assign @amwat
Would you mind taking a look at this?

[amwat]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: amwat, jiahuif

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

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Needs approval from an approver in each of these files:

• config/jobs/kubernetes/cloud-provider-gcp/OWNERS [amwat]

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[k8s-ci-robot]

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

• key cloud-provider-gcp-periodics.yaml using file config/jobs/kubernetes/cloud-provider-gcp/cloud-provider-gcp-periodics.yaml
• key cloud-provider-gcp-presubmits.yaml using file config/jobs/kubernetes/cloud-provider-gcp/cloud-provider-gcp-presubmits.yaml

In response to this:

k/cloud-provider-gcp is switching to docker from Bazel to build container images, as a step of producing the final tarballs.

This PR enables docker-in-docker (dind for short) for all tasks that invokes building, so that docker can be used for building container image.

Note: this change will NOT break current configuration.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.