Test unreleased docs action

Author: gonzalocasas

.github/workflows/docs.yml

@@ -14,6 +14,7 @@ jobs:
   docs:
     runs-on: ubuntu-latest
     steps:
-      - uses: compas-dev/compas-actions.docs@v4
+      - uses: compas-dev/compas-actions.docs@mkdocs
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
+          generator: mkdocs