Here's what I did.

Step one - migrate my build workflows to Docker.

My Github actions are now basically: "checkout / set env vars from secrets / docker-compose builder run make".

I used large machine runners to run full the Docker (Podman actually) on Github first to avoid dealing with docker-in-docker complications. This step also provided some very nice robustness advantages, as I can now trigger deployments from my laptop if needed.

Step two:

Migrate to self-hosted runners. I used my former homelab server to set up a build machine. It has 16Tb of fast NVMe SSDs and thanks to Podman container layer caching, my entire lint workflow now takes 30 seconds. Faster than just one "npm install" on Github before.

And Github's self-hosted runners are actually surprisingly easy to set up and use. They are also somewhat more robust.

Step three:

Swap Github for something else.