append -json to go test -race (#7800)

Co-authored-by: SaReN <[email protected]>

.github/workflows/test.yml

@@ -180,7 +180,7 @@ jobs:
         if: env.GIT_DIFF
       - name: test & coverage report creation
         run: |
-          cat pkgs.txt.part.${{ matrix.part }} | xargs go test -mod=readonly -timeout 30m -race -tags='cgo ledger test_ledger_mock'  > ${{ matrix.part }}-race-output.txt
+          cat pkgs.txt.part.${{ matrix.part }} | xargs go test -mod=readonly -json -timeout 30m -race -tags='cgo ledger test_ledger_mock'  > ${{ matrix.part }}-race-output.txt
         if: env.GIT_DIFF
       - uses: actions/upload-artifact@v2
         with: