[GitLab] Gitpod cannot find Dockerfiles in sub-directories

[jankeromnes]

Describe the bug

When specifying a Dockerfile in your .gitpod.yml on GitLab, but the Dockerfile is located in a sub-directory (i.e. not in repo root), then Gitpod fails with:

Steps to reproduce

1. Create private repo in GitLab
2. Create .gitpod.yml with:

image:
  file: test/Dockerfile

3. Create test/Dockerfile with:

FROM gitpod/workspace-full

Expected behavior

Opening the private GitLab repo in Gitpod should work.

Additional information

Example repository

[svenefftinge]

deployed now