WickedGoat98 I suspect the main difference is with GitHub your are cloning with https (i.e. not credentials needed) , but with gitlab you are using SSH authentication to clone the repository .If on the machine running the trains-agent you can "git clone" your repository (i.e. from command line), the trains-agent should be able to do the same (basically make sure you have the SSH keys in your ~/.ssh folder.

Are you testing the trains-agent service from (i.e. from the docker compose) or are you running trains-agent yourself ?