Hello, we have found 2 containers in our DockerSDK setup where we cannot say 100% what exactly they do, on the one hand it is the "frontend" and on the other hand the "cli_ssh_relay" Can someone answer that? Many thanks in advance

Frontend is the nginx that will route your request to zed, yves or glue, depending on the host you call. cli_ssh_relay is running a socat, which is commonly used for port forwarding. In the docker/sdk it's used to forward your ssh-auth socket so composer can use your existing ssh login information to run with and avoid running into githubs API rate limits (see https://github.com/spryker/docker-sdk/pull/138 for a few more details)