ci: update test command in workflow configuration

Change npm test command to make coverage for improved test reporting

  将 npm 测试命令更改为 make coverage，以改进测试报告

Change-Id: I25cf5b0c4b48bc4a2811fde07f7417e03577b001
Signed-off-by: OhYee <oyohyee@oyohyee.com>

Author: OhYee

.github/workflows/ci.yml

@@ -32,7 +32,7 @@ jobs:
         run: npm run lint
 
       - name: Test (unit tests only)
-        run: npm run test -- --testPathPattern="unittests"
+        run: make coverage
 
       - name: Build
         run: npm run build