diff --git a/.gitea/workflows/demo.yaml b/.gitea/workflows/demo.yaml
index d07e4c4..717e4c1 100644
--- a/.gitea/workflows/demo.yaml
+++ b/.gitea/workflows/demo.yaml
@@ -15,6 +15,13 @@ jobs:
           pwd
           ls /home
           echo "end outer print"
+
+      - name: manual docker test
+        run: |
+          pwd
+          touch testfile
+          ls
+          docker run --rm -v '.:.' -w '.' 'aergus/latex' /bin/bash -eo pipefail ls
       - name: compile
         uses: xu-cheng/texlive-action@v2
         with: