Add CI test for GPU linear algebra

[kose-y]

These are the first steps to set up gitlab-ci for GPU code with Julia:

https://github.com/JuliaGPU/gitlab-ci

First of all, you need to be the owner of your repository or Gitlab will fail to add a webhook. Your project also needs to be part of the GitLab JuliaGPU group:

• request permission to join the GitLab JuliaGPU group
• import your project (New Project, CI/CD for external repo), making sure you import it to the JuliaGPU group and not your own account

[aktech]

Hi @kose-y I am the creator of Cirun.io, "GPU" caught my eye.

FWIW I'll share my two cents. I created a service for problems like these, which is basically running custom machines (including GPUs) in GitHub Actions: https://cirun.io/

It is used in multiple open source projects needing GPU support like the following:

https://github.com/pystatgen/sgkit/ https://github.com/qutip/qutip-cupy

It is fairly simple to setup, all you need is a cloud account (AWS or GCP) and a simple yaml file describing what kind of machines you need and Cirun will spin up ephemeral machines on your cloud for GitHub Actions to run. It's native to GitHub ecosystem, which mean you can see logs/trigger in the Github's interface itself, just like any Github Action run.

Also, note that Cirun is free for Open source projects. (You only pay to your cloud provider for machine usage)