Update testem configuration

Author: Turbo87

testem.js

@@ -9,8 +9,16 @@ module.exports = {
   browser_start_timeout: 120,
   browser_args: {
     Chrome: {
-      mode: 'ci',
-      args: ['--disable-gpu', '--headless', '--remote-debugging-port=9222', '--window-size=1440,900'],
+      ci: [
+        // --no-sandbox is needed when running Chrome inside a container
+        process.env.CI ? '--no-sandbox' : null,
+        '--headless',
+        '--disable-dev-shm-usage',
+        '--disable-software-rasterizer',
+        '--mute-audio',
+        '--remote-debugging-port=0',
+        '--window-size=1440,900',
+      ].filter(Boolean),
     },
   },
 };