CI: Set CI project directory safe for git

Since the git clone done by CI has its own uid and git operations
occurring within the build container uses a different uid, we need to
add the CI_PROJECT_DIR folder to the safe directory git configuration.

This is related to CVE-2022-24765 [1].

[1] https://github.blog/2022-04-12-git-security-vulnerability-announced/



Signed-off-by: Thierry Escande <thierry.escande@huawei.com>