fix ci with https://github.com/actions/upload-pages-artifact#file-per…

…missions

.github/workflows/pages.yml

@@ -49,7 +49,6 @@ jobs:
           rsync -av html-slides/content/ html-book/ --ignore-existing
           rsync -av html-slides/ --exclude 'content' html-book/ --ignore-existing
           find html-book/ -regex .*\.html | xargs sed -i 's#./../../../#../../#g'
-          chmod +rw html-book
 
       # TODO: Without making a _branch_ that bloats the .git object,
       #       we should push out the static build files in html-book/ and html-slides/ to some archive,
@@ -59,6 +58,9 @@ jobs:
       - name: Setup Pages
         id: pages
         uses: actions/configure-pages@v3
+      - name: Fix permissions # https://github.com/actions/upload-pages-artifact#file-permissions
+        run: |
+          chmod -c -R +rX "_site/" 
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v2
         with: