Test PR Multiple cache froms #328
Merged
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This is the same as #323 (which is, in turn, the same as #271). They were duplicated only to trigger builds.
If you are interested in the background, you should read the discussions on the previous PRs.
Description of Original PR
We're using this to --cache-from intermediate and final stages of a multi-stage docker build, instead of busting the cache every time on building the intermediate target.