It's re-implementation of the GHA self-hosted runner in Go for self-hosted runners, based on the popular https://github.com/nektos/act for running GHA locally. Been using this for over a year now and it's been infinitely useful for CI on otherwise unsupported systems (e.g. freeBSD, openBSD in my case).
> Local Task Runner - I love make. However, I also hate repeating myself. With act, you can use the GitHub Actions defined in your .github/workflows/ to replace your Makefile!
This is ass backwards. Throwing out a tried and true build system in favor of a vendor-specific yaml format? Wtf? Just invoke make from your actions ffs.
The tool is here to run GHA tasks locally, period. It's not a replacement for a Makefile.
And I agree with you: use `make` in your actions!
If I want to make sense of the sentence, the only thing I can think of is that, before making this tool, they were using a Makefile locally to replicate the content of their GHA tasks.
Instead use mise tasks.