ci: add ci steps for running benchmark tests

Added third party gh-action for A/B testing
of performance degradation.

Follows up #122

Author: vr009

.github/workflows/testing.yml

@@ -44,3 +44,17 @@ jobs:
 
       - name: Run tests
         run: make test
+
+#      - name: Run becnchmark
+#        run: |
+#          make bench > a.txt &&
+#          git checkout HEAD~1 &&
+#          make bench > b.txt &&
+#          go benchcmp new.txt old.txt &&
+
+      - uses: WillAbides/benchdiff-action@v0
+        id: benchdiff
+        with:
+          benchdiff_version: 0.5.8
+          status_name: bench-result
+          benchdiff_args: --base-ref=origin/HEAD --count=5 --benchtime 50ms --benchstat-output markdown