I've been testing out Github Actions for a few weeks now, for the most part I really like it, there are a few features missing but I think the fundamentals of the product are solid with the public catalogue of actions being the killer feature.

The biggest issue I have is around self-hosted runners.

1. There's no official auto-scaling runner option, so even if you're paying Github (aka Microsoft) for Enterprise - they're not going to support your auto-scaling EKS/GKE/EC2/whatever runners.

2. You can't register self-hosted runners without a Personal Access Token - the key word being _Personal_. Your automation code for provisioning runners should not rely on an individuals Github access token just to register, they need to have a system like GitLab has where you can generate a registration token per-organisation/team/repo that allows you to programmatically register runners.