Second try

Author: cwingard

.github/workflows/docs-preview.yml

@@ -26,8 +26,9 @@ jobs:
       - name: Add package to PYTHONPATH
         run: echo "PYTHONPATH=$PYTHONPATH:$(pwd)" >> $GITHUB_ENV
 
+      - name: Set fork site_url
+        run: |
+          sed -i "s|site_url:.*|site_url: https://${{ github.repository_owner }}.github.io/${{ github.event.repository.name }}/|" mkdocs.yml
+
       - name: Deploy
-        run: >
-          mkdocs gh-deploy --force
-          --config-file mkdocs.yml
-          -e site_url=https://${{ github.repository_owner }}.github.io/${{ github.event.repository.name }}/
+        run: mkdocs gh-deploy --force