clone_from still asking for a fingerprint confirmation. #1591

Hi All.

I use GitPython in a unit test's fixture: it clones a repo during setup to download a stub service I can test my client against.

When I execute the tests locally there is absolutely no issue: the repo is cloned as intended. I use an SSH key.

When I use a CI environment into which I don't have an SSH key, the during clone_from I get a confirmation message: "Are you sure you want to continue connecting (yes/no/[fingerprint])?".

Using when I've found so far in the project's issues, I came up with this code:

with Git().custom_environment(
        GIT_SSH_COMMAND=
        'ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=accept-new -o http.sslVerify=false'
):
    _ = Repo.clone_from(
        url="ssh://git@bitbuckettsabdx.psc.tasfr.thales:7999/tsisbcube/b3_tools.git",
        to_path=temp_dir
    )

I'd like to skip the confirmation message, as the environment is, obviously, not interactive.

Thanks in advance for your help.