Investigate the ssh askpass error on https url workspace start

[vinokurig]

Is your task related to a problem? Please describe

We have a case where an ssh related error appears in the project-clone container startup, but HTTP url was used.

2026/05/26 21:53:23 Using temporary directory /projects/project-clone-735268498
2026/05/26 21:53:23 Read DevWorkspace at /devworkspace-metadata/flattened.devworkspace.yaml
2026/05/26 21:53:23 Processing project default-project
2026/05/26 21:53:23 Cloning project default-project to /projects/project-clone-735268498/default-project
Cloning into '/projects/project-clone-735268498/default-project'...
Error: passphrase file is missing in the '/etc/ssh/' directory
error: unable to read askpass response from '/.ssh-askpass/ssh-askpass.sh'
fatal: could not read Username for 'https://repo.example.com/': No such device or address
2026/05/26 21:53:24 Encountered error while setting up project default-project: failed to clone project: failed to git clone from https://repo.example.com/bitbucket/scm/~user/hello-dallas.git: exit status 128

Describe the solution you'd like

This case is not reproduced on dogfooding and other che clusters, so need to investigate the problem.

Describe alternatives you've considered

No response

Additional context

No response