Use cp

Author: ecomodeller

.github/workflows/docs.yml

@@ -29,7 +29,7 @@ jobs:
     - name: Commit documentation changes
       run: |
         git clone https://github.com/DHI/fmdap.git --branch gh-pages --single-branch gh-pages
-        xcopy docs\_build\html gh-pages\ /sy
+        cp -r docs/_build/html/* gh-pages/
         cd gh-pages
         touch .nojekyll
         git config --local user.email "action@github.com"