We run a Cockpit instance on the pubnix, which you can use at https://cockpit.p.projectsegfau.lt.
This allows you to run commands, manage Podman containers etc right from your browser.
All you need is your password. You use your SSH key for authentication when you SSH into the pubnix, so you'll need to do that first.
When you're in, run cat ~/pass and you will see your password. You use this password for logging in with Cockpit.
Once you've entered your password, you should probably save it in your password manager.