docker-base: ignore return code of systemd-tmpfiles
    
    Ignore the return code of the systemd-tmpfiles command because
    at this point we have already removed the /etc/machine-id (8f3beac)
    and all tmpfiles lines with %m in them will fail and cause a bad
    return code. Example failure:
      [/usr/lib/tmpfiles.d/systemd.conf:26] Failed to replace specifiers: /run/log/journal/%m
    
    (cherry picked from commit a4ae07133928d8614905d12145ddc545f761c151)