Add sshd into workspace default devfile
MR: Pending
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## Description
Follow up on the Slack discussion, we would like to add `sshd` into workspace default image.
Also need to decide if we would like to update in `install-essential` script or just in our own dockerfile.
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## Acceptance criteria
- [ ] Decide where to install `openssh-server` for workspace default image (likely not `install-essential`)
- [ ] Install and publish default image
- [ ] Update GitLab to use latest workspace default image
## Implementation plan
TODO: Fill out or delete (optional)
[Provide a high-level plan for implementation of this issue, including relevant technical and/or design details.]
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