Update ci.yml

further test for display?!

.github/workflows/ci.yml

@@ -69,6 +69,7 @@ jobs:
           # export DISPLAY=$(cat /etc/resolv.conf | grep nameserver | awk '{print $2; exit;}'):0.0
           /usr/bin/Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
           echo ">>> Started xvfb"
+          export DISPLAY=:99.0
           npm run test --if-present
 
 #       - name: Run Sonar Scan