[CI] don't download cache if contexts have not changed #1058
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Since the cache is defined by the context, if the combined cache exists with the given name then there is no need to download it, only check its existence with
lookup-only
. If it doesn't exist, then save it at the end with the dedicatedactions/cache/save
action.This is a transparent change to the user, but should decrease the CI run time because the workflow is not needlessly downloading the cache every time.