First attempt at continous benchmark

Author: Martin Boje Carpentier

.github/workflows/continous-benchmark.yml

@@ -0,0 +1,43 @@
+name: Run benchmark
+on:
+  push:
+
+jobs:
+  benchmark:
+    name: Performance regression check
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./src
+    
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup .NET Core
+        uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: |
+            3.1.x
+            5.0.x
+            6.0.x
+      # Run benchmark with `go test -bench` and stores the output to a file
+      - name: Run benchmark
+        run:  dotnet run --project .\GeoJSON.Text.Test.Benchmark\GeoJSON.Text.Test.Benchmark.csproj --framework net6 -c Release -- --job short --filter *
+      # 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: rhysd/github-action-benchmark@v1
+        with:
+          # What benchmark tool the output.txt came from
+          tool: 'benchmarkdotnet'
+          # 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: true
+      # Upload the updated cache file for the next job by actions/cache