For everyone who had the patience to read through everything, here is my solution to make clearml work with ssh-agent forwarding in the current version:
Start and ssh-agent Add ssh keys with ssh-add to agent echo $SSH_AUTH_SOCK and paste into clearml.conf as here: https://github.com/allegroai/clearml-agent/issues/45#issuecomment-779302144 (replace $SSH_AUTH_SOCKET with actually value) Move all the files except known_hosts out of ~/.ssh of the clearml-agent workstation. Start the clearml-agent.