Add benchmark workflow

.github/workflows/benchmark.yaml

@@ -0,0 +1,25 @@
+name: Benchmark
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: 1.22
+
+      - name: Run benchmarks
+        run: go test -benchmem -bench .