Update Makefile

[wlan0]

Remove tag override

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[aarongalang]

Suggested change

	IMAGE_NAME=gcr.io/k8s-staging-sig-storage/objectstorage-controller
	IMAGE_NAME=gcr.io/k8s-staging-sig-storage/objectstorage-controller
	IMAGE_TAGS=$(TAG)

I tried running, but while it did build and push correctly, it still gave the canary tag. I think what is happening is that the tag we want is not being added, and that build.make creates a canary image by default since no tag is found. IMAGE_TAGS is needed to add a new image, so either we could just type in our tag there, or if we need to get it from cloudbuild.yaml, replace the push arg in line 18 of cloudbuild.yaml with args: ['push', 'TAG=${_GIT_TAG}'] and commit the above changes. This will make it so cloudbuild calls push with the tag as an argument, and have the makefile accept it and add it to the tags.