We have used this many times during GitHub outages. It's great and does what it says.

But just one word of warning: when you run `act` with no arguments, what does it do? Displays usage? Nope -- it runs all workflows defined in the repo, all at once in parallel!

This seems like a crazy default to me. I've never wanted to do anything remotely like that, so it just seems both dangerous and inconvenient all at once.

Nice otherwise though...