Run without sandboxing when smoke testing on linux

.github/workflows/ci.yml

@@ -73,7 +73,7 @@ jobs:
           ./dist/*.AppImage --appimage-extract
           sudo apt-get update
           sudo apt-get install -y xvfb
-          xvfb-run squashfs-root/AppRun
+          xvfb-run squashfs-root/AppRun --no-sandbox
 
       - name: Smoke test Windows exe
         if: matrix.os == 'windows-latest'