Use var for envs #308

Job	Run time
Publish Image (dataset-initializer-v2, cmd/initializer_v2/dataset/Dockerfile, linux/amd64,linux/a... / Publish Image	3m 14s
Publish Image (model-initializer-v2, cmd/initializer_v2/model/Dockerfile, linux/amd64,linux/arm64... / Publish Image	1m 19s
Publish Image (kubectl-delivery, build/images/kubectl-delivery/Dockerfile, linux/amd64,linux/arm6... / Publish Image	1m 9s
Publish Image (storage-initializer, sdk/python/kubeflow/storage_initializer/Dockerfile, sdk/pytho... / Publish Image	10m 26s
Publish Image (trainer-huggingface, sdk/python/kubeflow/trainer/Dockerfile, sdk/python/kubeflow/t... / Publish Image	6m 8s
Publish Image (training-operator, build/images/training-operator/Dockerfile, linux/amd64,linux/ar... / Publish Image	23m 37s
Publish Image (training-operator-v2, cmd/training-operator.v2alpha1/Dockerfile, linux/amd64,linux... / Publish Image	17m 34s
	1h 3m 27s

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