doc: obey SOURCE_DATE_EPOCH with manpage generation #735
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Previously if a cobra user didn't specify an explicit .Date header, the
current time would be included in all of the generated man pages each
time they were built. This causes an issue for reproducible builds,
since each re-build of a package that includes the man pages will have
different times listed in the man pages.
To fix this, add support for SOURCE_DATE_EPOCH (which is a standardised
packaging environment variable, designed to be used specifically for
this purpose).
Signed-off-by: Aleksa Sarai asarai@suse.de