miryoku seeeduino build

So I'm trying to follow the instructions from the old reddit community to build the miryoku firmware for [seeeduino_xiao_ble, chiper36, Colemak, default, Mac, flip, default, default, default, default].

https://www.reddit.com/r/ErgoMechKeyboards/comments/12tvpsf/workflow_build_for_miryoku_with_the_revxlp_and/

But I'm new to github and don't quite get it. How do I select zmkfirmware/zmk/main build actions? I only see master as an option.