Build cpp on windows is broken

https://github.com/gengjiawen/uvwasi/runs/255955641

I don’t know if the windows has cmake, but it clearly not run the cmake command.

this is becaue npx exited the cmd.exe process try putting the npx call in its own run step or creating a conditional step for windows that uses powershell as the default shell.

How should I fix this ? Any link I can check ?

https://github.com/gengjiawen/os-init/pull/3/files

separate looks like works.