feat: ssh access to sessions with jump host

[olevski]

Enables ssh access in notebooks via a jump host.

Depends on: SwissDataScienceCenter/renkulab-docker#291

It requires images from the PR above to be used in the session. Otherwise there is no ssh server in the session.

To test this do the following:

• Create a project which uses an image from the PR above
• Add your public keys into the project at .ssh/authorized_keys
• Start a session with an image that has a SSH server
• Port forward to the jump host kubectl port-forward svc/renku-notebooks-ssh 2022:22
• To access the session via SSH run ssh -J jovyan@localhost:2022 jovyan@<session_id>. The session id is the name of the JupyterServer resource in k8s. It is also in the url where you access the session in the browser.

/deploy #persist renku-core=feature/ssh-into-sessions extra-values=notebooks.ssh.enabled=true

[Panaetius]

Port forward to the jump host kubectl port-forward svc/renku-notebooks-ssh 2022:22

is this just temporary until we can expose the port properly?

[olevski]

is this just temporary until we can expose the port properly?

Yes. And exposing the port will only for dev.renku.ch and production deployments. Not every single CI or personal deployment.

[RenkuBot]

You can access the deployment of this PR at https://renku-ci-nb-1389.dev.renku.ch