gha: add a continuous benchmark action

.github/workflows/bench.yml

@@ -0,0 +1,34 @@
+name: go continuous benchmark
+on:
+  push:
+    branches:
+      - v1
+
+permissions:
+  contents: write
+  deployments: write
+
+jobs:
+  benchmark:
+    name: Run Go continuous benchmark
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v4
+        with:
+          go-version: "stable"
+      - name: Run benchmark
+        run: go test -v ./... -bench=. -run=xxx -benchmem | tee output.txt
+
+      - name: Store benchmark result
+        uses: benchmark-action/github-action-benchmark@v1
+        with:
+          name: Go Benchmark
+          tool: 'go'
+          output-file-path: output.txt
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          # Push and deploy GitHub pages branch automatically
+          auto-push: true
+          # Show alert with commit comment on detecting possible performance regression
+          alert-threshold: '200%'
+          comment-on-alert: true