Support of ssh keys generated with other algorithms

[felladrin]

Is your feature request related to a problem? Please describe.

I didn't have an id_rsa (only id_ed25519), so when I first tried to ssh into the container, I got access denied.

(After that I just generated an rsa key and it worked fine.)

Describe the solution you'd like

If it's that correct that the container won't work with ed25519 keys, could the command displayed on the top of the app be changed to ssh -i ~/.ssh/id_rsa -p 8082 gitpod@localhost?

Otherwise, could it include also other keys (including ed25519) when the container is started?