Update main.yml

Author: mcbarton

.github/workflows/main.yml

@@ -321,14 +321,14 @@ jobs:
         run: |
           micromamba create -n xeus-lite-host jupyterlite-core=0.6 jupyterlite-xeus -c conda-forge
           micromamba activate xeus-lite-host
-          jupyter lite serve --settings-overrides=overrides.json --XeusAddon.prefix=${{ env.PREFIX }} \
+          timeout 200 jupyter lite serve --settings-overrides=overrides.json --XeusAddon.prefix=${{ env.PREFIX }} \
                          --XeusAddon.mounts="${{ env.PREFIX }}/share/xeus-cpp/tagfiles:/share/xeus-cpp/tagfiles" \
                          --XeusAddon.mounts="${{ env.PREFIX }}/etc/xeus-cpp/tags.d:/etc/xeus-cpp/tags.d" \
                          --contents README.md \
                          --contents notebooks/xeus-cpp-lite-demo.ipynb \
                          --contents notebooks/smallpt.ipynb \
                          --contents notebooks/images/marie.png \
-                         --contents notebooks/audio/audio.wav
+                         --contents notebooks/audio/audio.wav &
           python -m pip install nbdime
           python -m pip install selenium
           python scripts/automated-notebook-run-script.py --driver chrome