TEMP : try to use haskell-actions to setup stack

todos: modify template, remove trailing spaces

somehow on osx-12 stack was just available

.github/workflows/build-macos.yaml

@@ -89,6 +89,12 @@ jobs:
       - name: Enable building with magic
         run: |
           perl -pli -e 's/magicmime: false/magicmime: true/' stack.yaml
+      
+      - name: Install haskell 
+        uses: haskell-actions/setup@v2
+        with:
+          # cabal-version: 'latest'. Omitted, but defaults to 'latest'
+          enable-stack: true
 
       - name: stack setup
         run: stack setup