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Complete persistence has its downsides, as you can start getting "path dependency". E.g. a build succeeds only because some images were pre-cached by a previous build.

But having an _option_ to not download everything every time is great. You can add a periodic cache flushing, after all.

I repurposed old M1/M4 Mac Mini's at my workplace into GitHub action runners. Works like a charm, and made our workflows simpler and faster. Persisting the working directory between runs was a big performance boost.

> Hardware is getting cheaper and cheaper

Unfortunately not anymore and not in the foreseen future if we don't see some AI investment corrections.