This sets SOURCE_DATE_EPOCH to the commit timestamp, toolchains
should pick up timestamps from this variable.
The same sources ideally would produce the same binary, see
https://reproducible-builds.org.
Set the timestamps within the tar archives to the start of the
CI pipeline.
Sort the archive contents.
The generated tar archives contain the uid/gid of the builder,
if unpacked as root on another system those will denote nothing
or an unexpected user/group.
The expectation would be uid/gid = 0.
Use a simple enough tar format as well.
The Mac version of tar (bsdtar?) does not support those flags,
for CI the separate gnu-tar is installed.
These were missed in ad30b74173.
The mismatch between upload-artifact and download-artifact in
ad30b74173 makes the later steps
fail to download the artifacts from previous steps.
Martin Storsjö