ci: add support for uploading tests result in codecov (scaleway#5068)

Author: remyleone

.github/workflows/coverage.yml

@@ -20,6 +20,11 @@ jobs:
         with:
           go-version: stable
       - name: Run coverage
-        run: go test -coverprofile=coverage.out -covermode=count ./...
+        run: go tool gotestsum --format github-actions --junitfile junit.xml -- -coverprofile=coverage.out -covermode=count ./...
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v5
+      - name: Upload test results to Codecov
+        if: ${{ !cancelled() }}
+        uses: codecov/test-results-action@v1
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}