Add webpacker caching support #1103
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Cache the default webpacker folders. This consists of the compiled output and a last-compilation-digest-ENV file, resulting in re-use of the existing pack files when the manifest. This cut
rails assets:precompiledown from 240.79s -> 42.85s on one of my apps.Webpacker obviously wasn't a thing with rails4, but I chose to implement here quickly as a proof of concept.