Original Korean guide and practice Dockerfiles in this ZIP: CC0 1.0 Universal.
https://creativecommons.org/publicdomain/zero/1.0/

Hadolint itself is not included. Its license and third-party notices are available at
https://github.com/hadolint/hadolint/blob/master/LICENSE
https://github.com/hadolint/hadolint/blob/master/ThirdPartyNotices.txt
