Merge pull request #931 from MichaelMure/benchmark

gha: add a workflow to continuously run benchmarks

.github/workflows/benchmark.yml

@@ -0,0 +1,47 @@
+name: Benchmarks
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - master
+
+permissions:
+  # deployments permission to deploy GitHub pages website
+  deployments: write
+  # contents permission to update benchmark contents in gh-pages branch
+  contents: write
+
+jobs:
+  benchmark:
+    name: Performance regression check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-go@v1
+      # Run benchmark with `go test -bench` and stores the output to a file
+      - name: Run benchmark
+        run: go test -v ./... -bench=. -run=xxx -benchmem | tee output.txt
+      # Download previous benchmark result from cache (if exists)
+      - name: Download previous benchmark data
+        uses: actions/cache@v1
+        with:
+          path: ./cache
+          key: ${{ runner.os }}-benchmark
+      # Run `github-action-benchmark` action
+      - name: Store benchmark result
+        uses: benchmark-action/github-action-benchmark@v1
+        with:
+          # What benchmark tool the output.txt came from
+          tool: 'go'
+          # Where the output from the benchmark tool is stored
+          output-file-path: output.txt
+          # Where the previous data file is stored
+          external-data-json-path: ./cache/benchmark-data.json
+          # Workflow will fail when an alert happens
+          fail-on-alert: false
+          # GitHub API token to make a commit comment
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          # Enable alert commit comment
+          comment-on-alert: true
+          # Push and deploy GitHub pages branch automatically
+          auto-push: true