run benchmark in CI

Author: methane

.github/workflows/test.yml

@@ -96,6 +96,10 @@ jobs:
         run: |
           go test -v '-race' '-covermode=atomic' '-coverprofile=coverage.out' -parallel 10
 
+      - name: benchmark
+        run: |
+          go test -run '^$' -bench .
+
       - name: Send coverage
         uses: shogo82148/actions-goveralls@v1
         with: