generalize copy command with var and *

Author: harisont

.github/workflows/build-binary-packages.yml

@@ -219,7 +219,7 @@ jobs:
         cabal install --only-dependencies 
         cabal configure
         cabal build
-        copy dist-newstyle\build\x86_64-windows\ghc-9.6.7\gf-3.11.0\x\gf\build\gf\gf.exe C:\tmp-dist
+        copy dist-newstyle/build/x86_64-windows/ghc-${{matrix.ghc}}/*/x/gf/build/gf/gf.exe C:/tmp-dist
 
     - name: Upload artifact
       uses: actions/upload-artifact@v4