The current proposed build workflow for the quay-operator only works for building the redhat-3.5 branch.

We want to be able to build any of the supported Y-stream branches using the same workflow file. For that, we need the workflow to get the image tag from somewhere other than a hard-coded env var.
Here's an example of how this could be done: https://github.com/flavians-test-org/.github/blob/main/workflow-templates/build-and-publish.yaml#L24-L29