keep-git-dir flag not recognized

[tydra-wang]

ADD --keep-git-dir=true <git ref> <dir>

got an error: Unknown flag: keep-git-dir

dockerfile references:
https://docs.docker.com/engine/reference/builder/#adding-a-git-repository-add-git-ref-dir

[rcjsuen]

Thanks for raising this issue. Will take a look...

[rcjsuen]

The actual work has been completed and was tracked by rcjsuen/dockerfile-utils#117. Will keep this issue open for tracking the work to adopt the change in the language server itself.

[rcjsuen]

This is now fixed in the latest 0.11.0 release of the language server. Thank you for bringing this issue to our attention, @tydra-wang.