Description of problem:

DevSpaces cannot find devfile in the hosted GitLab server private repositories where OAuth integration is in place and works successfully.

When pointing to a GitLab private repository that has devfile.yaml at the root of the repository, it gets the following error:

{{2023-07-19 22:37:53,849[nio-8080-exec-3]  [DEBUG] [.e.c.a.f.s.u.URLFactoryBuilder 128]  - Unreachable devfile location met: https://gitlab.mycompany.com/api/v4/projects/openshift%2Fdevspace-platform/repository/files/devfile.yaml/raw. Error is: Server returned HTTP response code: 400 for URL: https:// gitlab.mycompany.com /api/v4/projects/openshift%2Fdevspace-platform/repository/files/devfile.yaml/raw

}}

When you try to access the above link, you get: 

{{

}}

According to GitLab's API docs, ref is a required field to list repository: https://docs.gitlab.com/ee/api/repository_files.html

and if you add ?ref=main to the URL (like https://gitlab.mycompany.com/api/v4/projects/openshift%2Fdevspace-platform/repository/files/devfile.yaml/raw?ref=main), it returns the devfile. 

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

Use a hosted GitLab private repository URL that has devfile at the root to create a workspace. 

Actual results:

Devfile could not be found. Applying default configuration.

Expected results:

Workspace environment to be created based on the devfile.yaml in the repository.

Reproducibility (Always/Intermittent/Only Once):

Always

Acceptance criteria: 

Able to create workspace from devfile inside the private GitLab repository (hosted) where OAuth config is in place

Definition of Done:

Build Details:

Additional info (Such as Logs, Screenshots, etc):

 *