[ide] Investigate the impossibility of connecting via SSH to some workspaces using custom Docker images

[felladrin]

We've found one case where the use of a Custom Docker Image in .gitpod.yml caused the SSH connection to fail (which makes it also impossible to connect using JetBrains IDE): https://github.com/spring-projects/spring-petclinic/

In this specific repository, it seems it started failing after this change: spring-projects/spring-petclinic@5aef5c3

Originally discussed in #12163 (comment)

[jeanp413]

I was with the impression it is not expected for gitpod to work with MS docker images as they have custom changes. I remember trying and sometimes it didn't even build, have that changed?

[jeanp413]

This is funny, it doesn't even work when trying to connect from the terminal xD cc @iQQBot

In this specific repository, it seems it started failing after this change: spring-projects/spring-petclinic@5aef5c3

Tried the commit before that change and same issue, I'd say this bug applies to all MS images

[loujaybee]

I was with the impression it is not expected for gitpod to work with MS docker images - @jeanp413

This is somewhat related to the ongoing challenge we have with Gitpod about the visibility of the underlying image for a Gitpod workspace. It's possible that we want to mark certain images or images with certain characteristics as incompatible (or at least warn users of unexpected behaviours):

• Epic: Improve versioning and rollout of workspace images #10683

[akosyakov]

It seems to be because of this image has another user and it somehow breaks installing SSH keys.