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Caching via remote runners
Caching via remote runners (such as Earthly Satellites) works by simply reusing the same runner for multiple builds. The runner retains the cache between executions, and thus is able to perform significantly better than any caching mechanism that relies on upload and download. There is nothing special that needs to be configured for this to work. All of the features of caching in Earthly work as expected, including layer caching and cache mounts.