Add src/SOURCE_DATE_EPOCH to release tree
#14574
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The Crystal compiler version info (
crystal --version) includes a date representing the chronological aspect of the comiler version.It's supposed to represent the date of the source code. But this information is not available in a bare snapshot of the source tree. The
Makefiletries to read the date of the last commit fromgit, which requiresgitand the repository.This patch adds a file
src/SOURCE_DATE_EPOCHwhich sits alongsidesrc/VERSIONto have both data available next to each other.It gets automatically populated in the release process and is removed afterwards. So it should only be available in the source tree of tagged release commits.
A practical use case for this is NixOS/nixpkgs#306765 as well as any other package build that doesn't use the git repository.