41e144e Use $SOURCE_DATE_EPOCH (if set) in discinfo file

Authored and Committed by Marek Marczykowski-Górecki 5 years ago
    Use $SOURCE_DATE_EPOCH (if set) in discinfo file
    
    This helps the output image to be reproducible.
    
    Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>