fcbc3ed buildinstall: No copy if task fails

Authored and Committed by lsedlar 2 years ago
    buildinstall: No copy if task fails
    
    Even a failed lorax task can leave behind some in-progress images. Pungi
    needs to copy the files into compose/ subdirectory only if the task
    finished successfully.
    
    Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1485021
    Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
    
        
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