update testcafe pipeline

.gitlab-ci.yml

@@ -6,6 +6,13 @@ test-frontend:
   image: node:latest
   stage: test
   script:
+    - apt-get update -yqqq
+    - apt-get install -yqq xvfb
+    - apt-get install iceweasel -yqq
+    - apt-get install dbus-x11 -yqq
+    - Xvfb :99 -screen 0 1280x720x24 -ac &
+    - export DISPLAY=:99
+    - export $(dbus-launch)
     - npm install 
     - npm install -g testcafe
     - testcafe --list-browsers