Ensures tests are run against the previously built image. #1054
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In some rare cases, image is built on GPU worker 1 and tests are run on GPU worker 2. If GPU worker 2 has already an image with the
${branch_name}-pretest
tag from a previous build, then, the tests are ran against the wrong image.Solution: Always pull before running the tests. If the image on the worker is already the latest, this is a NoOp. If it is an image from a previous build, it will pull the latest image from GCR.