Attempt to fix permission issue

Author: JamesMcMahon

.github/workflows/slides-to-github-pages.yaml

@@ -20,16 +20,16 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Copy Slide Assets
+        run: mkdir -p _site/slide-assets && cp -r slide-assets/ _site/
+
       - name: Convert Markdown into HTML
         uses: docker://marpteam/marp-cli:v4.2.1
         with:
           args: slide-deck.md -o _site/index.html --allow-local-files --html
         env:
           MARP_USER: root:root
 
-      - name: Copy Slide Assets
-        run: mkdir -p _site/slide-assets && cp -r slide-assets/ _site/
-
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3