Pass PULL_BASE_REF through to cluster-api builds.

[Katharine]

This will cause _PULL_BASE_REF to be available as a substitution to cluster-api's cloudbuild.yaml.

_PULL_BASE_REF will be the name of the ref that was pushed, e.g. master or release-0.2 or v0.2.

Due to GCB's strictness, merging this without updating that file to reference _PULL_BASE_REF in substitutions and $_PULL_BASE_REF in steps will cause it to fail to build. The strictness can (and probably should) be alleviated by adding this to the cloudbuild.yaml:

options:
  substitution_option: ALLOW_LOOSE

/cc @detiber @vincepri
/hold

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Katharine

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• config/jobs/image-pushing/OWNERS [Katharine]

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[detiber]

I created kubernetes-sigs/cluster-api#1406 to unblock this PR.
/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 66509562201042a30c759218b5bba1c6a03fa31e

[Katharine]

/hold cancel

[k8s-ci-robot]

@Katharine: Updated the job-config configmap in namespace default using the following files:

• key k8s-staging-cluster-api.yaml using file config/jobs/image-pushing/k8s-staging-cluster-api.yaml

In response to this:

This will cause _PULL_BASE_REF to be available as a substitution to cluster-api's cloudbuild.yaml.

_PULL_BASE_REF will be the name of the ref that was pushed, e.g. master or release-0.2 or v0.2.

Due to GCB's strictness, merging this without updating that file to reference _PULL_BASE_REF in substitutions and $_PULL_BASE_REF in steps will cause it to fail to build. The strictness can (and probably should) be alleviated by adding this to the cloudbuild.yaml:

options:
 substitution_option: ALLOW_LOOSE

/cc @detiber @vincepri
/hold

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