Use using existing ghcup/ghc/mingw installations on Windows
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develop7 commented
I've discovered Github Actions' Windows workers have ghcup & couple of latest GHCs preinstalled by https://github.com/actions/runner-images/blob/main/images/windows/scripts/build/Install-Haskell.ps1 and mingw preinstalled by https://github.com/actions/runner-images/blob/main/images/windows/scripts/build/Install-Mingw64.ps1
UPD: and Stack too, at https://github.com/actions/runner-images/blob/main/images/windows/scripts/build/Install-Stack.ps1
Is there a way this action could use them instead of installing them from scratch?