That’s what GNU Parallel is for. Or Pueue, which gives you a GH-Actions-level feature set but it’s less likely to be installed on any particular machine. Pretty sure you could fetch a pueue binary at the start of an actions script and do everything that way.
(These can’t project their tasks over multiple GH Actions runners, eg for multiple OSes. For that you will need to use the YAML. Good compilers will already do work in parallel and max out however many cores they are given, so multi machine is the main use case. Unfortunate.)
(These can’t project their tasks over multiple GH Actions runners, eg for multiple OSes. For that you will need to use the YAML. Good compilers will already do work in parallel and max out however many cores they are given, so multi machine is the main use case. Unfortunate.)