Import Helm Chart where only public code into local repository.
$ helm plugin install https://github.com/k-kinzal/helm-import
$ helm import URL
-h, --help help for import
https://example.com/path/to/file.tgz
https://github.com/user/repo/
https://github.com/user/repo/tree/branch
https://github.com/user/repo/tree/branch/path/to
helm-import supports these URL patterns.