docs: Use Codecov badge to replace the old one which was work with Kover

Author: zhe-zhao

.github/badges/branches.svg

@@ -53,35 +53,6 @@ jobs:
         with:
           working-dir: ./backend
 
-
-#      Comment out for now. Since Kover does not generate jacoco.csv report today
-#
-#      - name: Generate Test Coverage Badge
-#        uses: emibcn/badge-action@v1.2.1
-#        with:
-#          label: coverage
-#          status: ''
-#          jacoco-csv-file: ./backend/build/reports/jacoco/test/jacocoTestReport.csv
-#          generate-branches-badge: true
-#
-#      - name: Generate JaCoCo Badge
-#        uses: cicirello/jacoco-badge-generator@v2
-#        with:
-#          jacoco-csv-file: ./backend/build/reports/jacoco/test/jacocoTestReport.csv
-#          generate-branches-badge: true
-#
-#      - name: Log coverage percentage
-#        run: |
-#          echo "coverage = ${{ steps.jacoco.outputs.coverage }}"
-#          echo "branch coverage = ${{ steps.jacoco.outputs.branches }}"
-#
-#      - name: Commit and push the badge (if it changed)
-#        uses: EndBug/add-and-commit@v7
-#        with:
-#          default_author: github_actions
-#          message: 'doc: update test coverage badge'
-#          add: '*.svg'
-
       - name: Upload Kover coverage reports
         uses: codecov/codecov-action@v2
         with:

.github/badges/jacoco.svg

@@ -5,8 +5,7 @@
 
 [![Backend test](https://github.com/thoughtworks/metrik/actions/workflows/backend_test.yaml/badge.svg)](https://github.com/thoughtworks/metrik/actions/workflows/backend_test.yaml)
 [![Frontend test](https://github.com/thoughtworks/metrik/actions/workflows/frontend_test.yaml/badge.svg)](https://github.com/thoughtworks/metrik/actions/workflows/frontend_test.yaml)
-![Coverage](.github/badges/jacoco.svg)
-![Branches](.github/badges/branches.svg)
+[![codecov](https://codecov.io/gh/thoughtworks/metrik/branch/main/graph/badge.svg?token=KON1ADTCCD)](https://codecov.io/gh/thoughtworks/metrik)
 
 [![Release](https://img.shields.io/github/v/release/thoughtworks/metrik.svg?include_prereleases&style=flat)](https://github.com/thoughtworks/metrik/releases)