presubmit build have one extra argument

[Jeffwan]

/bin/bash -c /mnt/test-data-volume/kubeflow-xgboost-operator-presubmit-build-70-9aa764f-7905-1ef1/src/kubeflow/xgboost-operator//build_image.sh 

/mnt/test-data-volume/kubeflow-xgboost-operator-presubmit-build-70-9aa764f-7905-1ef1/src/kubeflow/xgboost-operator/Dockerfile 
gcr.io/kubeflow-ci/xgboost-operator 
v1.0

In build_image.sh scripts, we only consume two arguments.

xgboost-operator/build_image.sh

Lines 10 to 12 in 78f8cf5

	DOCKERFILE=$1
	CONTEXT_DIR=$(dirname "$DOCKERFILE")
	IMAGE=$2

If we add extra argument, it will v1.0 will be assigned which may brings problems. I meet this problem working on #70

At the beginning, I use TIMEOUT=${3-:30m} then it grants v1.0 to timeout and fail the test.

I think we can either delete v1.0 tag, since build_image.sh generate dirty tags here

xgboost-operator/build_image.sh

Line 16 in 78f8cf5

TAG=$(git describe --tags --always --dirty)

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Issue-Label Bot is automatically applying the labels:

Label	Probability
kind/bug	0.91

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