try ghcup before setup-haskell

Author: andreasabel

.github/workflows/validate.yml

@@ -225,15 +225,24 @@ jobs:
 
       - uses: actions/checkout@v4
 
+      # # See https://github.com/haskell/cabal/pull/8739
+      # - name: Sudo chmod to permit ghcup to update its cache
+      #   run: |
+      #     sudo ls -lah /usr/local/.ghcup/cache
+      #     sudo mkdir -p /usr/local/.ghcup/cache
+      #     sudo ls -lah /usr/local/.ghcup/cache
+      #     sudo chown -R $USER /usr/local/.ghcup
+      #     sudo chmod -R 777 /usr/local/.ghcup
+
+      - name: Install extra compiler
+        run: ghcup install ghc ${{ matrix.extra-ghc }}
+
       - uses: haskell-actions/setup@v2
         id: setup-haskell
         with:
           ghc-version: ${{ matrix.ghc }}
           cabal-version: latest
 
-      - name: Install extra compiler
-        run: sudo ghcup install ghc ${{ matrix.extra-ghc }}
-
       - name: GHC versions
         run: |
           ghc --version