Allow to override build date with SOURCE_DATE_EPOCH

Bernhard M. Wiedemannrequested to merge
bmwiedemann/libnvidia-container:date into master

Allow to override build date with SOURCE_DATE_EPOCH in order to make builds reproducible.

See https://reproducible-builds.org/ for why this is good and https://reproducible-builds.org/specs/source-date-epoch/ for the definition of this variable.

This date call only works with GNU date.

Signed-off-by: Bernhard M. Wiedemann bwiedemann@suse.de

This PR was done while working on reproducible builds for openSUSE.

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