add benchmark workflow

.github/workflows/benchmark.yml

@@ -0,0 +1,59 @@
+on:
+  push:
+    branches:
+      - master
+      - main
+    paths:
+      - "**"
+      - "!**.md"
+  pull_request:
+    paths:
+      - "**"
+      - "!**.md"
+
+permissions:
+  deployments: write
+  contents: write
+
+name: Benchmark
+jobs:
+  Compare:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Fetch Repository
+        uses: actions/checkout@v4
+
+      - name: Install Go
+        uses: actions/setup-go@v4
+        with:
+          # NOTE: Keep this in sync with the version from go.mod
+          go-version: "1.20.x"
+
+      - name: Run Benchmarks
+        run: |
+          set -o pipefail
+          for d in */ ; do
+            cd "$d"
+            go test ./... -benchmem -run=^$ -bench . | tee -a ../output.txt
+            cd ..
+          done
+        shell: bash
+
+      - name: Get Previous Benchmark Results
+        uses: actions/cache@v3
+        with:
+          path: ./cache
+          key: ${{ runner.os }}-benchmark
+
+      - name: Save Benchmark Results
+        uses: benchmark-action/github-action-benchmark@v1.18.0
+        with:
+          tool: "go"
+          output-file-path: output.txt
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          benchmark-data-dir-path: "benchmarks"
+          fail-on-alert: true
+          comment-on-alert: ${{ github.event_name == 'push' || github.event_name == 'workflow_dispatch' }}
+          #summary-always: ${{ github.event_name != 'push' && github.event_name != 'workflow_dispatch' }}
+          auto-push: ${{ github.event_name == 'push' || github.event_name == 'workflow_dispatch' }}
+          save-data-file: ${{ github.event_name == 'push' || github.event_name == 'workflow_dispatch' }}