45256db backend: properly delete logs for builds

2 files Authored by praiskup 4 years ago, Committed by praiskup 4 years ago,
    backend: properly delete logs for builds
    
    We used to create rsync log in chroot directory before (old builds), and
    the build-{}.log wasn't pre-fixed by zeroes.  So add compat fix so we
    remove those files automatically.
    
    Relates: #345
    
        
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