chore(dlcm-portal): add karma conf

add karma conf to run test on chrome headless without window

src/karma.conf.js

@@ -26,6 +26,17 @@ module.exports = function (config) {
     logLevel: config.LOG_INFO,
     autoWatch: true,
     browsers: ['Chrome'],
+    customLaunchers: {
+      ChromeNoSandboxHeadless: {
+        base: 'Chrome',
+        flags: [
+          '--no-sandbox',
+          '--headless',
+          '--disable-gpu',
+          '--remote-debugging-port=9222'
+        ]
+      }
+    },
     singleRun: false,
     restartOnFileChange: true
   });