Podcvd supports cache subcommand#2748
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cacheis the last piece for supporting all subcommands under podcvd. However, it was a bit complicated to support this functionality, as it wasn't available to create hard links for cached artifacts since directories were under different filesystems(separated bind mounts).So this PR suggests to add copy-based fallback mechanism when creating hard links is not applicable, and then support
podcvd cache. Copy-based fallback has worse performance than hard links, but better performance than not enabling any caching mechanism.Context: b/491256959