post-submit job failure in master branch

[Jeffwan]

https://argo.kubeflow-testing.com/workflows/kubeflow-test-infra/kubeflow-tf-operator-postsubmit-v1-3320f7f-6336-11ab?tab=workflow&nodeId=kubeflow-tf-operator-postsubmit-v1-3320f7f-6336-11ab-775640279

W
error checking push permissions -- make sure you entered the correct tag name, and that you are authenticated correctly, and try again: getting tag for destination:
tag can only contain the runes `abcdefghijklmnopqrstuvwxyz0123456789_-.ABCDEFGHIJKLMNOPQRSTUVWXYZ`: $(PULL_PULL_SHA)

Seems it's related to #1336

/kaniko/executor --dockerfile=/mnt/test-data-volume/kubeflow-tf-operator-postsubmit-v1-3320f7f-6336-11ab/src/kubeflow/tf-operator/build/images/training-operator/Dockerfile --context=dir:///mnt/test-data-volume/kubeflow-tf-operator-postsubmit-v1-3320f7f-6336-11ab/src/kubeflow/tf-operator --destination=$(ECR_REGISTRY):$(PULL_PULL_SHA)

em.. Post submit jobs doesn't have PULL_PULL_SHA.. That's the reason.

[Jeffwan]

/bug

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.