[CI] Update workflow

.github/workflows/unit-test.yml

@@ -19,9 +19,20 @@ jobs:
     - name: Install dependencies
       run: |
         sudo apt-get update
-        sudo apt-get install -y libboost-all-dev libfmt-dev
+        sudo apt-get install -y libboost-all-dev libfmt-dev lcov
 
     - name: Run unit test
       run: |
         cd extras/test/unit
         ./test.sh
+
+    - name: Measure test coverage
+      run: |
+        cd extras/test/unit
+        ./coverage.sh
+    
+    - name: Upload coverage report as artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage_report
+          path: extras/test/unit/lcov.report.zip