Before the task is started, the output directory is checked and if it
exists and is not empty, the runroot task will be skipped. This is meant
for debugging when restarting the same compose. Under usual
circumstances, the directory will not be created in the first place.
The runroot task will start by removing the output directory. This way,
if koji restarts the task, lorax will not fail.
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
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