CI jobs on Windows cannot use OpenGL

Summary

Projects which use OpenGL seem to not be able to use OpenGL reliably. This did work at one point, but I have no idea what might have changed (different machine, probably different gitlab-runner version).

Steps to reproduce

Try to use OpenGL in a Windows CI job.

Actual behavior

OpenGL contexts cannot be created.

Expected behavior

OpenGL contexts should work.

Environment description

We're using Windows 10 with gitlab-runner install running as a user that is set up to auto-login. On one machine, we just had to tell Qt to create an OpenGL context (by default it wanted EGL). On a new machine we set up, no OpenGL context works.

Used GitLab Runner version

We have a patched gitlab-runner to address (unrelated) issues (directory path manipulation and logic to only allow specific projects to use global runners). It is based on 13.5.0 though.

Possible fixes

This article might be useful, though I have no idea how much control over CreateProcess golang offers.