propagating keys in dind

[basz]

I'm trying to use this container inside a gitlab-ci build with a private repository.

Repositories from github.com install fine, but for my private repo's I keep getting 'Host key verification failed." errors.

here is the current experiment I'm working on: https://gist.github.com/basz/87a0467541cc9f8dbd64a2f992a712df#file-gistfile1-txt-L11

Note that the git clone private-repo-url does work, telling me that key and known hosts are setup correctly on the 'docker:git' container.

It's a linux box, latest docker and gitlab (via docker)

edit: clue: Im now thinking it has something to do with the MOUNT_POINT environment var mentioned in here: https://docs.gitlab.com/ee/ci/docker/using_docker_build.html#use-docker-in-docker-executor The dind composer container might need to mount file/dirs from that...