gaogaotiantian commented on PR #57083:
URL: https://github.com/apache/spark/pull/57083#issuecomment-4907314883

   I think the idea makes sense. We probably don't want actions from other 
repos to push to our docker cache, so we can't just add `cache-to` for our 
regular workflows (there will also be bandwidth/time cost). Checking the cache 
regularly would save us plenty of time.
   
   This won't update the images for branches other than `master`, which is 
probably not a blocker. `master` is the most active CI branch anyway.
   
   The workflow should be really fast if the cache is hit, which means even if 
we do it daily, we won't lose 1 hr every day just to build the docker images 
(correct me if I'm wrong here because we probably need to readjust the 
frequency).


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