Fixing e2e demo

Author: s1hofmann

.github/workflows/snapshot_release.yaml

@@ -41,6 +41,12 @@ jobs:
       - name: Run Docker E2E tests
         if: ${{matrix.os == 'ubuntu-latest'}}
         run: docker exec nut-ci bash -c "bash $PWD/.build/build.sh ${PWD} ${{matrix.node}}"
+      - name: Upload screenshot
+        if: ${{matrix.os == 'ubuntu-latest' && matrix.node == '15'}}
+        uses: actions/upload-artifact@v2
+        with:
+          name: Container UI
+          path: /home/runner/work/nut.js/nut.js/ci.png
 
   deploy:
     needs: