Ensure backup B010 build cache is disabled when updating docker cache

https://eicweb.phy.anl.gov/containers/eic_container/-/blob/master/containers/jug/Dockerfile.dev#L97

added improvement label

mentioned in issue #63 (closed)

mentioned in commit f6f3f08d

mentioned in commit 2751d50f

closed with merge request !67 (merged)