add timeout for coverage

Author: hedzr

.github/workflows/go.yml

@@ -63,7 +63,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-go-
       - name: Test & Coverage
-        run: go test -v -race -coverprofile=profile.cov ./...
+        run: go test -v -race -timeout 30m -coverprofile=profile.cov ./...
       - name: Send coverage
         uses: shogo82148/actions-goveralls@v1
         with: