So just tried again and still it does not work.
This is what is in .ssh on my clearml-agent
-rw------- 1 tim tim 1,5K Apr 8 14:28 authorized_keys -rw-rw-r-- 1 tim tim 208 Apr 29 11:15 config -rw------- 1 tim tim 432 Apr 8 14:53 id_ed25519 -rw-r--r-- 1 tim tim 119 Apr 8 14:53 id_ed25519.pub -rw------- 1 tim tim 432 Apr 29 11:16 id_gitlab -rw-r--r-- 1 tim tim 119 Apr 29 11:25 id_gitlab.pub -rw-rw-r-- 1 tim tim 3,1K Apr 29 11:33 known_hosts