git-credentials-secret mount path is hardcoded to theia user directory

Describe the bug

After configuring oAuth for GitHub, credentials secret git-credentials-secret is appeared in the user namespace. The secret has a hardcoded to /home/theia/.git-credentials mount path. This is ok for theia editor, where the home directory is /home/theia, but in che-code editor this doesn’t work because it knows nothing about theia.

Che version

next (development version)

Steps to reproduce

1. Configure GitHub oAuth: https://www.eclipse.org/che/docs/next/administration-guide/configuring-oauth-2-for-github/
2. Create a factory with a private project e.g. <che-url>/dashboard/#<url to a private github project>
3. Stop the factory workspace and start a che-code workspace: <che-url>/dashboard/#https://github.com/benoitf/codetogether-che-petclinic

See: the credentials file is located in /home/theia/.git-credentials/ folder

Expected behavior

The github credentials file must not be mounted to the hardcoded theia user directory.

Runtime

OpenShift

Screenshots

No response

Installation method

OperatorHub

Environment

macOS

Eclipse Che Logs

No response

Additional context

No response

[vinokurig]

Will merge after release

[amisevsk]

👍 to using /.git-credentials/credentials by default, it should be an easy change (just change the annotation used when creating the secret.

The alternative would be to have che-code resolve the proper path from gitconfig; I don’t know how hard that would be.