[Backport for 5.x] Keep backups, even when they're old #2912
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That is a backport for 5.x versions of #2734
It fixed an issue where webpacker would remove previous assets during clean, rather than keeping the specified number of backups and is currently only available in the 6.x beta.
Our rails projects are still currently using a custom fork of webpacker with this fix applied, but it seems many others have unearthed the same problem (#2443 (comment), Quimbee@624f687) backporting will fix up the issue for those yet to, or unable to, upgrade to 6.x.
/cc: @dkniffin @viniciusgama @braddunbar @oboxodo