As a PM trying to understand what was happening, it took me a minute. Turning this into an analogy so that it might benefit other non-too-techies:

Original plan: You have an oven in another building that automatically bakes your cake. But the oven needs a mixer, and every time you bake, it has to wait 2-3 minutes for someone to bring the mixer from storage.

Problem: For one specific oven (Linux ARM), the mixer never arrives. So your cake fails. You keep trying different ways to get the mixer delivered. Each attempt: 2-3 minutes wait.

What you finally do: Stop waiting for the mixer to be delivered. Just mix the batter at home where you already have a mixer. Send the pre-mixed batter to the other building. Now the oven just bakes it - no waiting for the mixer.

Translation: Stop trying to generate files in GitHub Actions (where it takes 2-3 minutes each time). Generate them locally on your computer where you already have the tools. Upload the finished files. GitHub Actions just uses them.

Sometimes "pre-mix the batter at home" beats "wait for the mixer every single time."