chore: jacoco report를 codecov에 업로드하는 github action 추가

.github/workflows/codecov.yml

@@ -0,0 +1,29 @@
+name: Workflow for Codecov
+on: [push, pull_request]
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v1
+        with:
+          java-version: 17
+
+      - name: Grant execute permission for gradlew
+        run: chmod +x ./gradlew
+        shell: bash
+
+      - name: Build with Gradle
+        run: ./gradlew build
+        shell: bash
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          verbose: true
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+          files: '**/build/jacocoHtml/index.html'