Some of our E2E tests use a docker.io-hosted image with a generic tag, which means we are subject to docker.io rate limiting (causing E2E tests to fail), and the contents of the image may change arbitrarily
I've mirrored the image to quay.io to avoid rate limiting on image pulls, and hardcoded the SHA in the test to ensure the content doesn't change
There's probably an even better place for it, or an alternative image, but for this PR the perfect is the enemy of the good
What does this PR do / why we need it: