Setup benchmarks github action (#2559)

* setup benchmarks github action

* run on go 1.16

* only run benchmarks on a push

* pin all actions

.github/workflows/benchmark.yml

@@ -0,0 +1,32 @@
+name: Benchmark
+on:
+  push:
+    branches:
+      - main
+env:
+  DEFAULT_GO_VERSION: 1.16
+jobs:
+  benchmark:
+    name: Benchmarks
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2.4.0
+      - uses: actions/setup-go@v2.2.0
+        with:
+          go-version: ${{ env.DEFAULT_GO_VERSION }}
+      - name: Run benchmarks
+        run: make test-bench | tee output.txt
+      - name: Download previous benchmark data
+        uses: actions/cache@v2.1.7
+        with:
+          path: ./benchmarks
+          key: ${{ runner.os }}-benchmark
+      - name: Store benchmarks result
+        uses: benchmark-action/github-action-benchmark@v1.13.0
+        with:
+          name: Benchmarks
+          tool: 'go'
+          output-file-path: output.txt
+          external-data-json-path: ./benchmarks/data.json
+          auto-push: false
+          fail-on-alert: true