Commits on Jun 13, 2024

1. Work around COPY --link limitations by pre-creating full filesystem… …

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   Without this, `COPY --link` insists on creating `/usr` and `/usr/local` for us, and does so with non-reproducible timestamps, defeating the purpose of our carefully crafted reproducible `/usr/local/go` -- this combats that by pre-creating a full `/target` directory that includes `/target/usr/local/go` so we can `COPY --link /target/ /` and get a *properly* reproducible layer.
   
   I've also added more sanity checks to validate our reproducibility assumptions (namely that our detected `SOURCE_DATE_EPOCH` value is older than our build/wall clock and that no files in our final tree are newer than our `SOURCE_DATE_EPOCH`).

   

   tianon committed Jun 13, 2024
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