overlay: set whiteout timestamps to 1970-01-01 (not to SOURCE_DATE_EPOCH) #3981
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Even with this commit, the
COPY --from=0 / /
workaround mentioned indocs/build-repro.md
is still needed for most Dockerfiles. (See PR #3980 for the reason)Partially closes #3168 (for overlayfs and stargz)
Relevant: