downloading ghc head version

Hi, I am trying to set up a CI for ghc head version. I am not sure what is the official supported method to install a nightly/head version of GHC. haskell/actions/setup on github seems to support it via ghcup. But it almost always fails, I saw it succeeding once till now. It tries to download it from the following URL, but fails with 404 not found: downloading: https://gitlab.haskell.org/ghc/ghc/-/jobs/artifacts/master/raw/ghc-x86_64-de... I tried this link in the browser and I get the same error. Is that the right way to install it? If not, can someone suggest a reliable way to get the head version, other than building it myself? Thanks, Harendra