60ee93caf8
This means slightly more typing in "zero-value" cases (`nil` vs `dockerfile.Metadata{}`), but the tradeoff is that it's simpler to use and reason about (and all the struct members are pointer-type map/slice values anyhow, so copying the struct is still pretty cheap).
This also swaps the scanner error handling to return the partially parsed Metadata object alongside the scanner error -- the error already tells us the object isn't fully complete data, so it's fair/fine to return and will likely just be ignored by the caller instead. This also allows us to get to 100% code coverage. 👀
This also updates our "treat `oci-import` just like `FROM scratch`" code to *actually* parse `FROM scratch` so we can't accidentally cause "missing data" bugs there in the future, and I implemented that using `sync.OnceValues` which requires upgrading to Go 1.21, but IMO that's a worthwhile tradeoff (because `sync.OnceValues` makes that code so clean/simple).
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